Petrova, Schnyder advance in Stuttgart

Stuttgart, Germany (Sports Network) - Fourth-seeded Russian Nadia Petrova and fifth-seeded Swiss Patty Schnyder were a pair of second-round winners on Thursday, while top-seeded Amelie Mauresmo withdrew from the $650,000 Porsche Tennis Grand Prix because of a right shoulder injury.
The world No. 1 Mauresmo was scheduled to meet Dutchwoman Michaella Krajicek in a second-round affair on Day 4, but the reigning Wimbledon and Australian Open champion pulled out of the draw, opening up a spot for American lucky- loser Lisa Raymond.
The French Mauresmo lost to American Lindsay Davenport in the last two finals at this event.
On the courts at Porsche Arena, Petrova handled German favorite Anna-Lena Groenefeld 6-3, 6-4, while Schnyder held off Israeli Shahar Peer 7-6 (7-3), 2-6, 6-4.
An upset came when Slovakian Daniela Hantuchova humbled sixth-seeded Russian Dinara Safina 6-2, 6-2.
Eighth-seeded Serbian Jelena Jankovic came from behind to defeat Tszvetana Pironkova of Bulgaria, 4-6, 6-2, 7-5 to advance.
In other second-round play, Krajicek leveled Raymond 6-4, 6-2 and France's Tatiana Golovin erased Czech Iveta Benesova 6-4, 6-3.