Anna Kournikova
In 2001, Kournikova suffered an injury to her foot which meant she was unable to play in many tournaments that year. She got better and won the doubles tournament at the Australian Open in 2002, again with Hingis. Other injuries like a bad back meant that in 2003, Kournikova played very few tournaments and said "I do not want to go on playing unless I can participate 100%".