It's official: Serena Williams has lost the U.S. Open Semifinal with Drake on hand showing his support in the stands. The 33-year-old tennis star was defeated in her match against Italian tennis player Roberta Vinci, thereby losing her bid to become the fourth female player in history to hold all four Grand Slam singles titles in one calendar year. The "Take Care" rapper, who is rumored to be dating tennis star, was intensely focused on the match and stood up a number of times to clap for his girl, sporting a furrowed brow as the competition drew to a close.