WARSAW, Poland - Maria Sharapova continued to remind the world why she holds three Grand Slam titles and made it all the way to No.1, cruising in the second match of her Sony Ericsson WTA Tour comeback to reach the quarterfinals of the $600,000 Warsaw Open on Wednesday afternoon.

Sharapova, who didn't play a singles match for nine months due to a nagging shoulder injury, won her first match back against Tathiana Garbin Monday and Wednesday added a 62 60 win over Darya Kustova to that, beating the Belarusian in 57 minutes.

While Sharapova is the most decorated player in the draw she isn't seeded, but that may not have been a good thing, as two of the last four seeds standing fell in their second round matches. No.3 seed Zheng Jie lost to Klara Zakopalova, 60 64; and No.5 seed Sara Errani fell to qualifier Alexandra Dulgheru, 64 63. No.6 seed Daniela Hantuchova and No.8 seed Alona Bondarenko managed to win, beating Urszula Radwanska and Marta Domachowska, both by 63 61 scorelines.

In other matches, Anne Keothavong defeated Jill Craybas, 36 63 61; Galina Voskoboeva beat Kateryna Bondarenko, 64 76(5); and qualifier Ioana Raluca Olaru beat Julia Goerges, rallying from 1-4 in the third to survive, 63 06 76(3).

The quarterfinals will be played Thursday, with Hantuchova playing Zakopalova, Bondarenko playing Sharapova, Keothavong playing Olaru and Voskoboeva facing Dulgheru. The latter two matches are first-time match-ups; Hantuchova and Sharapova are both 2-0 against their respective opponents.