Russian Nadia Petrova, stung by US teenager Melanie Oudin in the fourth round of the US Open, continued her rebound yesterday by reaching the quarter-finals of the WTA event in Quebec. 
 
Petrova, the top seed and defending champion in the US$220,000 ($312,460) tournament, beat Madison Brengle 6-3, 6-2 in
         
        
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