Serena Williams Loses in U.S. Open Semi-Finals to Unranked Roberta Vinci

Serena Williams
Serena Williams lunges for a shot in an early round of the 2015 U.S. Open. Mike Segar/Reuters

In the most shocking sporting upset in recent memory, Serena Williams has lost in the U.S. Open Semi-Finals.

The three-time defending U.S. Open champion fell in three sets (2-6, 6-4, 6-4) to unseeded Italian Roberta Vinci in this afternoon's semifinal match. Not only does Williams lose out on her seventh U.S. Open title, she falls two matches short of becoming the first tennis player—male or female—to win the Grand Slam in a calendar year since Steffi Graf accomplished that hallowed feat in 1988. Two more wins in Queens would have also given Williams her 22nd career major championship, which would have tied Graf's record.

Though Williams is still one of the greatest athletes to ever grace the hardcourt, this loss is a heartbreaker. Vinci goes on to play in the Final against fellow Italian Flavia Pennetta on Saturday.