Toronto, Aug. 8 -- Four seeded players fell to their opponents on the first day of the main draw at the annual Rogers Cup tennis tournament here in Canada' s largest city, while China' s Zheng Jie advanced to Round 2 to face one of the world' s best female tennis players on Tuesday.

In a spirited match, 28-year-old Zheng, ranked world' s 82, defeated 56-ranked Alberta Brianti of Italy, in two straight sets of 6-2 and 6-1, breaking Brianti' s serves three times in each set.

With today' s win, Zheng will go up against a formidable opponent on Tuesday in Kim Clijsters of Belgium, currently ranked world' s No. 2.

Clijsters, who won Rogers Cup in 2005, is the reigning champion of both the US Open and the Australian Open and a former No. 1 in both singles and doubles.

The two will face off in Tuesday' s closing game on Centre Court, in what will be Clijsters' first game in the 2011 Rogers Cup.

Rogers Cup is Canada' s most prestigious tennis tournament, held in Toronto and Montreal each August, with the two cities alternately hosting the world' s best male and female professional tennis players.

The event is on both of the Women' s Tennis Association' s (WTA) and the Association of Tennis Professionals' (ATP) world tours. This year Toronto is hosting the WTA tour while Montreal the ATP tour.

The 2011 Toronto event features the world' s current top 10 players, including No. 1 Caroline Wozniacki of Denmark, who was also the 2010 Rogers Cup winner; the 2011 Wimbledon champion, No. 7 Petra Kvitova of the Czech Republic, and the French Open champion, Li Na of China; as well as the Rogers Cup winners since 2005.

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