The secret life of Barty's No.1 weapon

By Darren Walton
Updated January 28 2022 - 7:06pm, first published 7:00pm
Ash Barty's serve has allowed her to win 81 of her last 82 service games to reach the Open final.

Super-coach Craig Tyzzer has detailed the lengths he and Ash Barty reach to perfect the most potent shot in women's tennis.

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