Roger Federer's form dropped drastically after an easy first set, and the top-ranked player was upset by Ernests Gulbis of Latvia 2-6, 6-1, 7-5 in his opening match of the clay-court season. Federer played his first singles match in nearly a month. He took off several weeks after losing to Tomas Berdych in the fourth round of the Sony Ericsson Open in Key Biscayne, Fla., on March 30. More...