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Meanwhile, O'Sullivan's hopes of a fourth title this season may come to a premature end at the hands of Maguire, who has beaten him on the last two occasions they have met.
BBC: It's a very tough start for me
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In the men's draw, top-seeded Nikolay Davydenko, who is bidding for his fourth title of the season, reached the last eight with a 6-1 6-1 win over Spain's Guillermo Garcia-Lopez.
BBC: Jankovic battles past Dushevina
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But Davydenko, who also won the Malaysian Open at the beginning of October, has put himself in a great position to take one of the three other available places with his fourth title of the season.
BBC: Davydenko wins Shanghai Masters