Nadal and Federer are joined in Group B by Jo-Wilfried Tsonga, who will be making his second appearance, and debutant Mardy Fish.

与费纳同在B组的还有第二次参加年终总决赛的特松加和初次露面的费什。

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He'll take on the winner of Friday night's semifinal between three-time Australian Open winner Roger Federer and 2008 finalist Jo-Wilfried Tsonga.

他在决赛中的对手将是周五的另一场半决赛三届澳网冠军罗杰·费德勒和2008打入决赛的特松加中的胜者。

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But Federer expects the Big Four will be challenged even more in the coming season, with the likes of Jo-Wilfried Tsonga and others in the Top 10 also in contention for major titles.

但是费德勒希望四巨头在下赛季能得到更多挑战，像乔-威尔弗雷德·特松加以及其他排名前10位的选手来争夺大赛冠军。

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But Federer expects the Big Four will be challenged even more in the coming season, with the likes of Jo-Wilfried Tsonga and others in the Top 10 also in contention for major titles.

但是费德勒希望四巨头在下赛季能得到更多挑战，像乔-威尔弗雷德·特松加以及其他排名前10位的选手来争夺大赛冠军。

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