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* Russian wins third title of 2012
* Great way to end season - Petrova
SOFIA, Nov 4 Russia's Nadia Petrova thrashed top-seeded Dane Caroline Wozniacki 6-2 6-1 on Sunday to secure her maiden Tournament of Champions trophy and a 13th career title.
It was the 30-year-old's third tournament victory of the year after winning a Wimbledon warm-up event in Den Bosch, Netherlands and the Pan Pacific Open in Tokyo in September.
"It's a great way to finish the season," Petrova said after receiving the trophy.
Winning the season-ending WTA event at the Armeets Arena in Sofia earned second seed Petrova a cheque for $270,000 and helped her rise one place in the world rankings to 12th.
Petrova, competing in the tournament for the second time after reaching the semi-finals last year, broke Wozniacki twice in the opening set to take command.
Wozniacki, watched by golfing boyfriend Rory McIlroy, then received medical treatment on her left calf but she was powerless to stop Petrova who produced some superb tennis in the second set.
The Russian looked much fresher despite having gone through an exhausting semi-final against Italian Roberta Vinci on Saturday.
Wozniacki began 2012 as the world number one but endured a mediocre season and had to wait until September to land her first trophy of the year at the Korea Open.
The Dane then won the Kremlin Cup in October.
It was the first time the Tournament of Champions was held in Sofia, having been relocated from Bali where it was staged for the previous three years. (Reporting by Angel Krasimirov; editing by Tony Jimenez and Ken Ferris)
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