Serena Williams has had a resurgence under Patrick Mouratoglou 's guidance . American had fallen to 7th in world and lost in the French Open first round . But with French ##man 's input Williams won final four grand slams last year . The quality of the game she is able to play at her age shows how much her game has evolved from most of the players . World No . 1 won 11 titles in 2013 , the best return since Martina Hingis in 1997 .
Serena Williams has had a resurgence under Patrick Mouratoglou 's guidance . American had fallen to 7th in world and lost in the French Open first round . But with French ##man 's input Williams won final four grand slams last year . World No . 1 won 11 titles in 2013 , the best return since Martina Hingis in 1997 .