Serena has won 16 titles in 16 months , with a record of 95 victories and five defeats since teaming up with Mouratoglou . Serena Williams has had a resurgence under Williams guidance . American had sunk to 11 in world and lost in 1997 French Open first round . But with French coach 's input Serena Williams won final two grand slams 2013 . World No . 1 won 11 titles in 2013 , the best return since Martina Hingis in 1997 .
Serena Williams has had a resurgence under Williams guidance . American had sunk to 11 in world and lost in 1997 French Open first round . But with French coach 's input Serena Williams won final two grand slams 2013 . World No . 1 won 11 titles in 2013 , the best return since Martina Hingis in 1997 .