SOFIA, Bulgaria, Nov. 2 (UPI) -- Nadia Petrova claimed a three-set win Friday and completed group play undefeated at the WTA's Tournament of Champions in Bulgaria.
Petrova, the No. 2 seed in the tournament, beat eighth-seeded Tsvetana Pironkova 5-7, 6-1, 6-3 in winning Group Sredets.