Editing Fast bowling (section)

=== Reverse swing ===
[[Reverse swing]] is a phenomenon that makes the ball swing in the opposite direction to that usually produced by the orientation of the shiny and rough sides of the ball.<ref name="Science" /> When the ball is reverse swinging, the ball swings towards the shiny side. Balls that reverse swing move much later and much more sharply than those swinging conventionally, both factors increasing the difficulty the batter has in trying to hit the ball. At speeds of over 90&nbsp;mph a ball always exhibits reverse swing, but as roughness increases on the leading side, the speed at which reverse swing occurs decreases.<ref name="Science" /> This means that an older ball is more likely to be delivered with reverse swing as its surface is roughened through use.

In [[reverse swing]] the seam is angled in the same way as in conventional swing (10–20 degrees to one side) but the boundary layer on both sides is turbulent. The net effect of the seam and rough side is that the ball swings in the direction opposite to where the seam is pointing to. The turbulent boundary layer separating later is similar to the effect produced by dimples in a golf ball. In case of the golf ball, turbulence is produced on both sides of the ball and the net effect is a later separation of the boundary layer on both sides and smaller wake in the back of the ball and a lower net drag due to pressure differential between the front and the back. This enables the golf ball to travel further.

The discovery of reverse swing is credited to Pakistan's cricketers, with [[Sarfraz Nawaz]] and Farrukh Ahmed Khan, both named as originators of the delivery.<ref>{{Cite news|url = https://www.telegraph.co.uk/sport/cricket/10963855/How-Pakistan-became-the-kings-of-swing.html|title = How Pakistan became the kings of swing|last = Oborne|first = Peter|date = 12 July 2014|work = The Telegraph|access-date = 16 July 2015}}</ref>