Petra Kvitova has won more three set matches than any player on the WTA since 2003. She has also played in more than anyone since 2005.
WTA Staff

BEIJING, China - With her 26 62 60 defeat of Varvara Lepchenko in the second round of the China Open on Tuesday, Petra Kvitova recorded her 22nd three set win of the season - most on the WTA. In fact, that is tied for the most this century, and she will have a good chance to break that record since she is scheduled to play at least a couple more events this year. Here are all of those with at least 20 WTA main draw three set wins in a season since 2000:

Player3-Set WinsYear
Anastasia Myskina222002
Ai Sugiyama222003
Petra Kvitova222013
Elena Dementieva212005
Lucie Safarova202011
Angelique Kerber202012

And having gone 22-11 in her three set matches this year, Kvitova has played in 33 three set matches - the most on the WTA since 2005. Here are all of those who have played in at least 30 WTA main draw three set matches since 2000:

Player3-Set MatchesYear
Patty Schnyder362005
Petra Kvitova332013
Anastasia Myskina322002
Ai Sugiyama322003
Jelena Jankovic302007
Lucie Safarova302011

Note: Roberta Vinci played in her 29th three set match of the year on Tuesday in Beijing and would join the above list with one more such match.