Top Seed Ash Barty Upset by American Alison Riske at Wimbledon

Getty ImagesWIMBLEDON, England (AP) Ash Barty's winning streak is over, and so are her chances of winning a second straight Glam Slam title.

The top-ranked Australian had won 15 matches in a row, including the French Open title, but she lost to Alison Riske 3-6, 6-2, 6-3 at Wimbledon on Monday, giving the unseeded American a spot in the quarterfinals of a major tournament for the first time.

''I haven't been starting out fantastic in all my matches, but I knew I had the confidence that if I could manage my service games I was going to get looks on her serve,'' said Riske, whose best previous showing was reaching the third round at Wimbledon and the fourth round at the 2013 U.S. Open. ''I had…