September 11, 2015 3:16 PM EDT

Roberta Vinci will move on to the U.S. Open finals after defeating Serena Willaims 26-64-64 in a shocking upset.

Vinci’s odds of winning were estimated to be 1 in 300, according to

Vinci’s victory ends Williams’ 33-match winning streak at the Grand Slams. Williams had a shot at becoming the first player to collect all four Grand Slam titles in a single season since Steffi Graf in 1988, the Associated Press reports.

Vinci is now the lowest-ranked U.S. Open finalist since Williams’ sister, Venus, in 1997. Serena beat Venus is a match earlier this week.

“Today is my day,” Vinci said in a post-game interview.

“She played literally out of her mind,” Williams said after the match.

Moments from the game are already making the rounds on social media

Write to Nolan Feeney at

Read More From TIME

Related Stories