Defending champion Sloane Stephens was beaten by Anastasija Sevastova 6-2, 6-3 in the quarterfinals on Tuesday at the U.S. Open, eliminating her from the tournament. Sevastova, the No. 19 seed from Latvia, will play either Serena Williams or 2016 U.S. Open runner-up Karolina Pliskova in her first Grand Slam semifinal. Stephens said she had been … Read more