The quarterfinal encounter of 2008 Indian Wells champion Ana Ivanovic and Marion Bartoli featured 13 breaks of serve in two sets that together lasted more than two hours. The 19th-seeded Ivanovic was desperately fighting, while for the most part of the match seed No.15 Bartoli had a small but valuable advantage. Something was constantly missing in Ivanovic's game and Bartoli moved into the semifinals of the high-profile BNP Paribas Open with a 6-4 7-6(4) victory.

In a slow set full of breaks, at 5-4 Bartoli was serving to win it, and even though Ivanovic earned two break opportunities to level the score, Bartoli prevailed. The second set also started better for Bartoli, but Ivanovic was constantly fighting, leveling, and even led 5-4 for a short time. Bartoli was later serving for the match at 6-5, and even though Ivanovic forced a tiebreak, her troubles were cut short in that set and Bartoli made her way into the semifinals.

It will be Bartoli's third semifinal of the season, after Brisbane and Doha. A semifinalist in Indian Wells earns $150,000. The 17th-ranked Frenchwoman will play either Shahar Peer or Yanina Wickmayer for a place in the title match. (photo: angelicalbite)

Dinara Safina's joy was short-lived, as her inspiring win over Samantha Stosur was followed by a 6-2 6-0 blowout by Maria Sharapova in the fourth round of the BNP Paribas Open. In the Russian battle of former No.1s, Sharapova gave no chances to Safina with her precise, powerful and aggressive display. Fellow blogger Forty Deuce, who is at the tournament, says that Safina was often left frozen on the court and that everything besides Sharapova's serve was reminiscent of the Australian Open 2008 Sharapova. Next for Masha will be Peng Shuai.

Top-seeded Caroline Wozniacki was made to work against Alisa Kleybanova in the fourth round, before prevailing 2-6 6-3 6-1 in one hour and 55 minutes. Wozniacki's quarterfinal opponent will be good friend Victoria Azarenka, seeded 8th. Azarenka saved four match points to battle past Agnieszka Radwanska 4-6 6-3 7-6(3) after three hours and four minutes. (photo: Tidalist)

In the encounter of two Serbian players and former No.1s, Ana Ivanovic eliminated defending champion Jelena Jankovic 6-4 6-2 in the fourth round of the BNP Paribas Open. Ivanovic, who won the tournament in 2008, having defeated Jankovic in the semifinals, has now extended her career record against the compatriot to 7-3.

Sixth-seeded Jankovic, who defeated current world No.1 Caroline Wozniacki to win the Indian Wells title last year, converted only one of seven break opportunities and after the match, the 26-year-old said how she felt flat, how her feet were not moving and her best game was not there. Ivanovic, on the other hand, was solid and took advantage of Jankovic’s weaknesses.

Quarterfinal opponent of the nineteenth-seeded Ivanovic will be Marion Bartoli. The Frenchwoman advanced when Kim Clijsters retired from their fourth-round encounter with a shoulder injury, despite winning the first set. Clijsters has been taking painkillers for the shoulder problem since before she won the 2011 Australian Open.

Here's how concerned Clijsters is about the injury: "On hard courts I know that I am able to control it. I'm concerned for what's coming up next, and that's the claycourt season." (photo via WTA Tour)

World No.108 Dinara Safina hadn't been able to win three matches in a row in more than a year (she rarely even won two) and now she scored her first Top 4 victory since 2008 by upsetting fourth seed Samantha Stosur in the third round of the BNP Paribas Open.

Despite 16 double faults, Safina's performance was strong, with powerful groundstrokes, successful aggressiveness and big returns. The Russian swept through the first set tiebreaker 7-2 and resisted a late Stosur's fightback in the second set to win 7-6(2) 6-4.

Safina's fourth round opponent will be No.18 seed Maria Sharapova, who is also coming back from injury. Sharapova had survived a marathon opener against Anabel Medina Garrigues, but cruised past seed No.20 Aravane Rezai 6-2 6-2 in the third round.

The Safina vs. Sharapova match will not be the only fourth round meeting between compatriots and former world No.1s. Serbs Jelena Jankovic, who is defending her title at Indian Wells, and Ana Ivanovic will also face each other. (photo: Forty Deuce)

World No.1 and last year's runner-up Caroline Wozniacki cruised to the fourth round of the BNP Paribas Open in Indian Wells by defeating Maria Jose Martinez Sanchez for the first time in their four meetings. In the 6-1 6-3 victory over the Spaniard, Wozniacki was just as dominant as in her opening match of the tournament, against Sloane Stephens in the second round.

Throughout the 71-minute match, the Stella McCartney-clad Dane held her serve and made no double faults, while she broke the 28th-seeded Martinez Sanchez four times.

Wozniacki's next opponent will be seed No.22 Alisa Kleybanova, who defeated 13th seed Flavia Pennetta 6-3 6-4 in the third round.

Additional info: Adidas has just launched the start of a new global  campaign which for the first time in their history showcases adidas' involvement in sport, music and fashion. Here's a very short teaser, featuring Wozniacki. If you would like to see the full video featuring Wozniacki a day early then check it out on facebook.com/adidas tomorrow (15th March). (photo via Tennis Served Fresh)