Sloane Stephens and Vania King -- both ranked outside the top 100 -- upset seeded players at the U.S. Open on Thursday, giving the United States five women in the third round, its most since 2004. The 106th-ranked Stephens, an 18-year-old from Los Angeles, beat 23rd-seeded Shahar Peer of Israel 6-1, 7-6 (4). More...