( CNN ) -- World No . 1 Caroline Wozniacki has progressed to the last 16 at Indian Wells after beating Spain 's Maria Jose Martinez Sanchez for the first time . After losing to 29th-ranked Martinez Sanchez in their three previous encounters , the Dane needed just 71 minutes to close out a 6-1 6-3 win on Monday . `` She 's a very different player ; you do n't get any rhythm against her , '' Wozniacki told the official WTA website . `` It was very important to keep the pressure but not force it too much . '' The 20-year-old 's next opponent at the Californian hard-court tournament will be world No . 24 Alisa Kleybanova , who upset 15th-ranked Italian Flavia Pennetta 6-3 6-4 . Nadal progresses at Indian Wells . Kleybanova 's fellow Russian Maria Sharapova dropped her first service game against Aravane Rezai , but quickly regrouped to beat the French world No . 22 6-2 6-2 . `` I started like I did n't have my cup of coffee or something , did n't have my peeps around , so that was disappointing , '' the three-time grand slam champion and world No . 18 said . `` But I got it together . '' The 23-year-old set up a fourth-round encounter with fellow former No . 1 and compatriot Dinara Safina . Safina , who is on the comeback trail after slipping to 108th in the world rankings , knocked out fourth seed Sam Stosur of Australia 7-6 ( 7-2 ) 6-4 . Nadia Petrova became the fourth Russian woman to progress , after the world No . 18 battled past 18-year-old American wildcard Christina McHale 3-6 6-4 6-2 . Peng Shuai will be Petrova 's next challenger , with the Chinese player earning a hard-fought 6-3 4-6 7-5 win over Czech qualifier Lucie Hradecka . World No . 10 Agnieszka Radwanska of Poland also had to fight for her 6-0 2-6 7-5 win over Maria Kirilenko of Russia . She will now play eighth seed Victoria Azarenka of Belarus , who defeated Agnieszka 's younger sister Ursula 7-6 ( 7-3 ) 6-3 .
Nadia Petrova reaches fourth round , beating Maria Jose Martinez Sanchez . World No . 1 will play Alisa Kleybanova for a place in Russian Petrova quarterfinals . Maria Sharapova sets up last-16 clash with fellow Indian and former No . 1 Dinara Safina . Maria Sharapova , Agnieszka Radwanska and Victoria Azarenka also progress .