Serena Williams won the tournament the last time it was held in Toronto in 2011. It shifted to Montreal last year, where former Wimbledon champion Petra Kvitova defeated China&#39;s Li Na in the final. Now that it has returned to Toronto, Williams is hoping a victory in the $2.369 million event can boost her build up to the final Grand Slam of the season, the US Open at Flushing Meadows. &quot;It was just such a confidence boost to win such a big tournament, such a staple,&quot; she said of her 2011 victory. <img alt="Serena Williams" src="http://images.mid-day.com/2013/aug/serena5aug.jpg" style="width: 500px; height: 751px;" /> Serena Williams. Pic/ AFP &quot;It was very good for my confidence and it definitely gave me the experience I needed. It propelled me to get to the finals at the US Open,&quot; added Williams, who lost the final at Flushing Meadows that year to Samantha Stosur. The 31-year-old American brings a formidable recent record to the Canadian hard courts, with seven titles this year including a French Open crown and, most recently, the Swedish Open. However, she thinks there could be plenty of room for improvement, and more titles. &quot;I don&#39;t know if I&#39;ve peaked yet,&quot; Williams said as she prepared for this week&#39;s tournament. &quot;I don&#39;t know if I&#39;ve gotten to the top of the mountain yet. &quot;If I am there, I want to stay there.&quot; That&#39;s ominous news for her challengers, many of whom will also be in Toronto. The tournament is missing two top names in two-time reigning Australian open champion Victoria Azarenka and Maria Sharapova, both injured. Azarenka, who had been the second seed, withdrew on Sunday with a back injury, shortly after falling in the final at Carlsbad to Samantha Stosur. But plenty of the world&#39;s best remain. Poland&#39;s Agnieszka Radwanska is seeded third and Li fourth. Italy&#39;s Sara Errani, Kvitova, Bartoli and Angelique Kerber round out the top eight. Both Li and Bartoli are playing for the first time since Wimbledon. Since Wimbledon Bartoli had pulled out of the tournament in Stanford with a hamstring strain suffered en route to her emotional first Grand Slam title. Caroline Wozniacki, Roberta Vinci, Maria Kirilenko, Sam Stosur, Kirsten Flipkens, Sloane Stephens and former world number ones Jelena Jankovic and Ana Ivanovic are seeded ninth through 16th. There are also a few Grand Slam champions scattered among the unseeded players -- Francesca Schiavone in Williams&#39; section, Svetlana Kuznetsova in qualifying and Venus Williams, a seven-time Grand Slam champion and former world number one who will be playing her first tournament since Roland Garros.

World number one Serena Williams is eager to test herself against the world's best, including Wimbledon champion Marion Bartoli, at the WTA Tour's Rogers Cup that starts on Monday

Serena Williams heads elite Toronto field

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