NEW YORK (AP) — Australian Open champ Stan Wawrinka tumbled into the stands, kept calling for the trainer, and still pulled away to reach the U.S. Open quarterfinals. The third-seeded Wawrinka won 7-5, 4-6, 7-6 (7), 6-2 on Monday against Tommy Robredo, who has given him trouble in the past.Read more on NewsOK.com