Sam Querrey, right, acknowledges the crowd after defeating Dustin Brown, left, of Germany, at the U.S. Men's Clay Court Championship in Houston, Texas, Friday, April 11, 2014.
"It didn't affect me at all my match," Querrey said. "But I woke up unable to bend forward or arch (my) back. We've been trying to loosen it up for three hours. I feel terrible . . . my first semi in a while and I really wanted to play. But (Almagro) was going to beat me (6-0, 6-0)."