Roger Federer assured himself the No. 1 ranking for the 300th week of his career by beating Davis Cup teammate Stanislas Wawrinka in the third round of the Shanghai Masters. "It's obviously an amazing number and I never thought of anything like this when I was a little kid," Federer said. "I just thought one day my dream would come true to play on the tour. So here I am at 300 weeks, and it's probably one of my biggest accomplishments and something I'm very proud of. No doubt about it."