INDIAN WELLS, CA, USA - All eight BNP Paribas fourth round matches will be played on Tuesday, with a former champion here and the WTA's match wins leader for 2013 among those taking the court.
Tuesday, Fourth Round
While Caroline Wozniacki has the edge in her series with Nadia Petrova, she will be the one out for revenge this time. In their last meeting in November's Sofia final, the Dane managed just three games.
Petrova has had the smoothest path to the fourth round of all players left in the draw, having surrendered just eight games in her two matches. While Wozniacki was extended to three sets in her opener, she was very sharp in allowing just three games versus Elena Vesnina in the third round.
This is Petrova's sixth time reaching the Indian Wells fourth round, however, she is still looking for her first quarterfinal berth. Wozniacki was victorious here in 2011 and runner-up in 2010.
 Sara Errani (ITA #8) vs.  Marion Bartoli (FRA #11)
Head to head: Errani leads 2-1
Though clay is still her favorite surface, Sara Errani has proven this year that she is quite comfortable on hardcourts too - having been runner-up at Paris [Indoors] and Dubai. And her confidence is certainly sky high, with 10 wins in her last 11 matches. The latest of those was her WTA-leading 20th win of the season, which put her into the fourth round here for the first time.
Marion Bartoli has had a clear path to the fourth round, including an impressive straight set defeat of Svetlana Kuznetsova in the third round. No stranger to success here, Bartoli was runner-up in 2011. She is seeking to end a two-match losing streak in her series with Errani.
 Agnieszka Radwanska (POL #4) vs.  Maria Kirilenko (RUS #15)
Head to head: Radwanska leads 6-2
Maria Kirilenko and Agnieszka Radwanska have a compelling history against each other. They have met on every surface, twice at Grand Slams and once at Indian Wells. And though Radwanska has the upper hand in the series, half of the matches have gone three sets and both of Kirilenko's wins have occurred on hardcourts.
Though she was tested against Sorana Cirstea in her last match, Radwanska has to be thrilled with her 19-3 start to the year. Kirilenko's season is one to be proud of as well, as she is now 12-3 and picked up her sixth WTA title last month in Pattaya City. Both her matches in Indian Wells have gone three sets and in fact she has five straight three-setters here dating back to last year.