Swing, seam and reverse swing are three different ways a fast bowler can move the ball. Fans often use them as if they mean the same thing. They do not.
Swing is movement in the air, before the ball pitches. Seam is movement off the pitch, after the ball pitches. Reverse swing is swing in the air, with an old ball, in the opposite direction to conventional swing.
Learn the difference, and you will know why a batter looks comfortable against one ball, and beaten by the next ball, from the same bowler, in the same over.
Swing: movement in the air
Swing is the ball curving in the air, after it leaves the bowler’s hand, and before it reaches the batter.
A cricket ball is not smooth. It has a seam, a raised line of stitching around the middle, and two sides, one shiny and one rough, after the ball has been used for a few overs. The bowler holds the ball with the seam at an angle, and releases it with the seam pointing in the direction he wants the ball to swing.
The air flows faster over the shiny side, and slower over the rough side, and the pressure difference pushes the ball towards the rough side, or away from the shiny side. That is conventional swing, in simple terms. The ball does not need to hit the pitch to swing. It swings in the air, and the batter has to play the line, not just the length.
Inswing: The ball swings in towards the batter. For a right-handed batter, an inswinger from a right-arm bowler starts outside off stump, and curves back in towards middle and leg stump, and towards the pads. It threatens the stumps, and the pads, and the inside edge.
Outswing: The ball swings away from the batter. For a right-handed batter, an outswinger from a right-arm bowler starts on middle and leg stump, and curves away towards the slips, and the outside edge. It threatens the outside edge, and the catch behind the wicket.
A bowler who can swing the ball both ways is dangerous, because the batter does not know which way the ball will go, until it is too late to change his shot.
Real example: Arshdeep Singh to Babar Azam, 2022 T20 World Cup, Melbourne.
Arshdeep Singh’s first ball in a World Cup, to Babar Azam, is the classic inswinger. Arshdeep, a left-arm bowler, released the ball wide of the crease, with the seam angled in, and the ball started outside off stump, and swung back in, and hit middle stump, after Babar had left a gap between bat and pad. Babar was bowled for a duck, on the first ball Arshdeep bowled in a World Cup, because he played the line, not the swing.
Arshdeep is now India’s lead swing bowler in T20Is, with 151 T20I wickets after Hamilton on 1 November 2026, and he reached 150 in Auckland on 30 October 2026, as the first Indian to 150 T20I wickets. His inswinger to a right-handed batter, from over the wicket, is his stock ball, because it angles across the batter, and then swings back in, and threatens both the outside edge and the stumps, at the same time.
Real example: Bhuvneshwar Kumar in New Zealand, October 2026.
Bhuvneshwar Kumar was recalled at 36, for the New Zealand tour, after a last T20I against New Zealand in Napier on 22 November 2022, because he can swing the new ball in New Zealand conditions, with 90 wickets in 87 T20Is, at an economy of 6.96. In Christchurch on 22 and 24 October 2026, he took 0/49 and 1/50, with his first T20I wicket in 1,430 days, Daryl Mitchell, in the second match. He did not take many wickets, but he swung the new ball, in the powerplay, when the ball was new and hard, and the conditions were cool and overcast, which is when swing is at its best.
Swing is best with a new ball, in cool, overcast, humid conditions, with a shiny ball, and with a bowler who can keep the seam upright. That is why New Zealand, in October and November, with morning cloud and sea breeze, is a swing bowler’s ground, and why India picked Bhuvneshwar, and Arshdeep, for the tour, even without Jasprit Bumrah, who was rested for the white-ball leg, and is Test-only.
Seam: movement off the pitch
Seam is movement off the pitch, after the ball pitches, not in the air.
A seam bowler lands the ball on the seam, with the seam upright, and the ball hits the pitch on the seam, and deviates, either in or out, by a few inches, or a few centimetres, off the pitch. The batter has played the line in the air, and then the ball moves, after it pitches, and beats the bat.
Seam movement is different from swing, in three ways:
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It happens after the pitch, not before. A batter can play a swing ball late, and adjust, because he sees the ball curving in the air. A seam ball moves after it pitches, and the batter has less time to adjust, because the ball is already close to him.
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It depends on the pitch, not the air. A seam bowler needs a pitch with grass, and with a hard surface, and with a seam that can grip, to move the ball off the pitch. A swing bowler needs a new ball, and cool, humid air, to move the ball in the air.
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It is less predictable. A swing bowler can control the direction of the swing, by angling the seam, and by shining one side. A seam bowler cannot control the direction of the seam movement, as precisely, because it depends on how the ball lands on the seam, and on the pitch, and on the grass, and on the wear.
Real example: Kyle Jamieson in Wellington, 27 October 2026.
Kyle Jamieson, 2.04 metres tall, a right-arm fast-medium bowler, took 2/45 in 3.2 overs in Wellington, dismissing Abhishek Sharma for 113, and Sanju Samson for 18, in India’s chase of 199. Jamieson does not swing the ball as much as Bhuvneshwar, but he hits the pitch hard, with the seam upright, and he gets bounce and seam movement, off a Wellington drop-in pitch, with grass, and with a hard surface. Abhishek was beaten by a ball that moved off the pitch, after he had played the line in the air, and Samson was beaten by a ball that bounced and seamed, in the same way.
Real example: Jasprit Bumrah, and the yorker.
Bumrah is not a conventional swing bowler, in the same way as Bhuvneshwar. He is a seam bowler, with a unique action, who can hit the pitch hard, and move the ball off the seam, in both directions, and who can bowl a yorker, at the toes, with late swing. In the 2026 T20 World Cup final, on 8 March 2026, in Ahmedabad, Bumrah took 4/15, as Player of the Final, with India defending 255/5, and beating New Zealand by 96 runs, to win a third T20 World Cup. His wickets were not just swing in the air, they were seam off the pitch, and a yorker at the death, that moved late, and beat the batter, after the ball had pitched.
A good seam bowler will bowl a length that is full, but not too full, and will land the ball on the seam, and will let the pitch do the work. A bad seam bowler will bowl too short, or too full, and will not land the ball on the seam, and will not move the ball, off the pitch, or in the air.
Reverse swing: swing with an old ball, in the opposite direction
Reverse swing is the most famous, and the most misunderstood, type of swing.
Conventional swing happens with a new ball, in the first 10 to 15 overs, when one side is shiny, and the other side is rough, and the ball swings towards the rough side.
Reverse swing happens with an old ball, after 30 to 40 overs, in a Test, or after 15 overs, in a white-ball game, when one side is very rough, and the other side is very shiny, and the ball swings in the opposite direction, towards the shiny side.
The physics is the same, but the direction is reversed, because the rough side is now so rough, that the air flow over it becomes turbulent, and the ball swings the other way. A bowler who can reverse swing the ball can make an old ball, that looks dead, move in the air, at pace, and late, and beat a batter who is set, and who has been playing the same ball for 30 overs.
Reverse swing needs three things:
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An old ball. The ball needs to be 30 to 40 overs old, in a Test, or 15 overs old, in a T20, with one side very rough, and the other side very shiny. A new ball will not reverse swing, because it is too smooth, on both sides.
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A shiny side, and a rough side. The fielding side polishes one side of the ball, with sweat, and with the shine, and lets the other side get rough, by hitting the pitch, and by hitting the boundary, and by being hit for boundaries. The difference between the two sides is what makes the ball reverse swing.
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Pace. Reverse swing needs pace, usually 140 km/h or more, to make the air flow turbulent, over the rough side, and to make the ball move late, in the air.
Real example: Wasim Akram and Waqar Younis, Pakistan, 1990s.
Wasim Akram and Waqar Younis, two left-arm and right-arm fast bowlers from Pakistan, were the masters of reverse swing, in the 1990s. They could make an old ball, after 40 overs, in a Test, swing in the air, at 145 km/h, and late, and bowl a yorker, at the toes, that swung in, and bowled a batter who had been set for 100 runs. Wasim could swing the ball both ways, conventional and reverse, with the same action, and Waqar could bowl a reverse-swinging yorker, that was almost unplayable, at the death, in a Test or an ODI.
Real example: Zaheer Khan, India, 2011 World Cup.
Zaheer Khan, India’s left-arm swing bowler, used reverse swing in the 2011 World Cup, in India, to take wickets with an old ball, in the middle and death overs, when the ball was 30 overs old, and the pitch was dry, and the ball was rough on one side, and shiny on the other. Zaheer could bowl a reverse-swinging yorker, at the death, that swung in, to a right-handed batter, and bowled him, or trapped him LBW, because the batter had played the line, not the reverse swing.
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How to tell them apart, in a match
If the ball moves in the air, before it pitches, it is swing. If it moves in towards the batter, it is inswing. If it moves away, it is outswing. If it moves late, just before it reaches the batter, it is late swing, and it is the most dangerous swing, because the batter has already committed to his shot.
If the ball moves off the pitch, after it pitches, it is seam. If it moves in, it is seam in. If it moves away, it is seam out. If it bounces, and moves, it is seam and bounce, and it is the hardest ball to play, because the batter has to play the line, the length, and the bounce, at the same time.
If the ball is old, and it moves in the air, in the opposite direction to the new ball, it is reverse swing. If a right-arm bowler’s outswinger, with a new ball, becomes an inswinger, with an old ball, it is reverse swing. If a left-arm bowler’s inswinger, with a new ball, becomes an outswinger, with an old ball, it is reverse swing.
A bowler can use all three, in the same spell. He can swing the new ball, in the powerplay, seam the ball in the middle overs, when the ball is 10 to 20 overs old, and reverse swing the old ball, in the death overs, when the ball is 30 to 40 overs old, in a Test, or 15 overs old, in a T20.
When does each one work best?
Swing works best: With a new ball, in the first 10 overs, in cool, overcast, humid conditions, with a shiny ball, and with a bowler who can keep the seam upright. That is why Bhuvneshwar, and Arshdeep, are at their best in New Zealand, in October and November, with morning cloud and sea breeze, and with a new ball, in the powerplay.
Seam works best: On a pitch with grass, and with a hard surface, and with a bowler who can hit the pitch hard, with the seam upright, and with a length that is full, but not too full. That is why Jamieson, and Bumrah, are at their best on a Wellington drop-in pitch, with grass, and with a hard surface, and with a ball that is 10 to 20 overs old.
Reverse swing works best: With an old ball, after 30 to 40 overs, in a Test, or after 15 overs, in a white-ball game, in dry, abrasive conditions, with a pitch that roughs up one side of the ball, and with a bowler who can bowl at 140 km/h or more, and who can shine one side, and let the other side get rough. That is why Wasim, Waqar, and Zaheer, were at their best in Pakistan, and in India, in dry conditions, with an old ball, and with a reverse-swinging yorker, at the death.
What does not work: Ball tampering, which is illegal. A bowler cannot scratch the ball with his nails, or with a bottle cap, or with sandpaper, or with any other object, to make one side rough. He can shine the ball with sweat, and with his clothes, and he can let the ball get rough, by hitting the pitch, and by being hit for boundaries, but he cannot deliberately damage the ball, to make it reverse swing. The umpires will change the ball, and the captain will be penalised, and the bowler will be reported, if he tampers with the ball.
Frequently asked questions
What is the difference between swing and seam?
Swing is movement in the air, before the ball pitches. Seam is movement off the pitch, after the ball pitches. A swing bowler moves the ball in the air, with the seam angled, and a shiny side and a rough side. A seam bowler moves the ball off the pitch, by landing the ball on the seam, with the seam upright.
What is inswing and outswing?
Inswing is the ball swinging in towards the batter. Outswing is the ball swinging away from the batter. For a right-handed batter, an inswinger from a right-arm bowler starts outside off stump, and curves back in towards middle and leg stump. An outswinger starts on middle and leg stump, and curves away towards the slips.
What is reverse swing?
Reverse swing is swing in the air, with an old ball, in the opposite direction to conventional swing. It happens after 30 to 40 overs, in a Test, when one side is very rough, and the other side is very shiny, and the ball swings towards the shiny side, not the rough side.
Why does reverse swing happen with an old ball?
Because the rough side becomes so rough, that the air flow over it becomes turbulent, and the ball swings the other way. A new ball will not reverse swing, because it is too smooth, on both sides.
Can a spinner swing the ball?
No, a spinner does not swing the ball in the air, in the same way as a fast bowler. A spinner turns the ball off the pitch, by spinning it, with his fingers or his wrist, and the ball moves off the pitch, after it pitches, not in the air, before it pitches.
Who are the best swing bowlers in the world?
Bhuvneshwar Kumar, Arshdeep Singh, Trent Boult, Tim Southee, and James Anderson, for conventional swing, with a new ball. Wasim Akram, Waqar Younis, and Zaheer Khan, for reverse swing, with an old ball. Jasprit Bumrah, and Kyle Jamieson, for seam, off the pitch.
The verdict
Swing, seam and reverse swing are not the same thing, and a batter who knows the difference will be a better batter, and a fan who knows the difference will be a better fan.
Swing is in the air, before the pitch, with a new ball, and with a shiny side and a rough side. Seam is off the pitch, after the pitch, with a grassy pitch, and with a seam upright. Reverse swing is in the air, with an old ball, in the opposite direction, after 30 to 40 overs, with a very rough side, and a very shiny side, and with pace.
In New Zealand, in October and November 2026, swing is the story, in the powerplay, with Arshdeep and Bhuvneshwar, with a new ball, in cool, overcast conditions. Seam is the story, in the middle overs, with Jamieson and Bumrah, with a hard pitch, and with a seam upright. Reverse swing will be the story, in the Tests, in Wellington on 19 to 23 November, and in Christchurch on 27 November to 1 December, with an old ball, after 30 to 40 overs, and with Bumrah, and with the New Zealand pace attack, trying to make an old ball move, late, in the air, and beat a batter who is set.
Watch the ball, not just the batter. If it moves in the air, it is swing. If it moves off the pitch, it is seam. If it is old, and it moves the other way, it is reverse swing.
Source list: Arshdeep to Babar, 2022 T20 World Cup, Melbourne, first ball, bowled, inswinger. Arshdeep 151 T20I wickets after Hamilton 1 Nov 2026, 150 in Auckland 30 Oct 2026. Bhuvneshwar recall 6 Oct 2026, 90 wkts in 87 T20Is, econ 6.96, 0/49 and 1/50 Christchurch Oct 2026. Jamieson 2/45 Wellington 27 Oct 2026, Abhishek 113, Samson 18. Bumrah 4/15 Player of Final, 2026 T20 World Cup final, 8 Mar 2026, Ahmedabad, India 255/5 vs NZ 159, won by 96 runs. Wasim Akram / Waqar Younis reverse swing, 1990s. Zaheer Khan reverse swing, 2011 World Cup.
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