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topspinner
A topspinner is a type of delivery bowled by a cricketer bowling either wrist spin or finger spin. In either case, the bowler imparts the ball with top spin by twisting it with his or her fingers prior to delivery. In both cases, the topspinner is the halfway house between the stock delivery and the ''wrong'un'' - in the wrist spinner's case his googly, and in the finger spinner's case his doosra.
==Mechanics==
A topspinner is released over the top of the fingers in such a way that it spins forward in the air towards the batsman in flight. The forward spinning motion impedes air travelling over the ball, but assists air travelling underneath. The difference in air pressure above and underneath the ball (described as the Magnus effect) acts as a downward force, meaning that the ball falls earlier and faster than normal.
In cricketing terms, this means that the ball drops shorter, falls faster and bounces higher than might otherwise be anticipated by the batsman. These properties are summed up in cricketing terms as a "looping" or "loopy" delivery. Also, the ball travels approximately straight on, as compared to a wrist spin or finger spin stock delivery that breaks to the left or right on impact. A batsman may easily be deceived by the ball, particularly given that the action is quite similar to the stock delivery. Compared to the stock delivery, the ball will dip in flight, and land shorter than expected. The majority of the time, this increased angle of descent will lead to an increased bounce, making it a particularly difficult ball to attack. Tactically, a bowler will bowl topspinners to draw a batsman forward before using the dip and extra bounce to deceive them. In particular, batsmen looking to sweep or drive are vulnerable as the bounce can defeat them and lead to a catch. However, on an underprepared soft wicket, the spin on the ball may actually cause it to grip and shoot through low. Again, this will make it a particularly difficult delivery for the batsman to deal with.〔Peter Philpott "The Art of Wrist Spin Bowling"〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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