By the time Mouratoglou started coaching Williams, she had just suffered her first-ever opening round defeat in the main draw of a Grand Slam tournament, losing in the first round of the 2012 French Open. Since then, Mouratoglou has guided Williams to her fifth, sixth and seventh Wimbledon titles, the Olympic gold medal, her fourth, fifth, and sixth US Open titles, her second and third French Open titles, three consecutive year-end championships titles, her sixth and seventh Australian Open title and lifted her back to world No. 1 in the WTA rankings.