Michaella Krajicek

Serena Williams of the US returns a shot to Michaella Krajicek of Netherlands during a Women's singles match at the US Open tennis tournament September 1, 2011. (credit: STAN HONDA/AFP/Getty Images)

Serena Williams Wins In Straight Sets At US Open

Serena Williams needed just 49 minutes to advance a day after her sister withdrew at the U.S. Open.