U.S. Open women's final ticket prices dive after Williams upset

Ticket prices for the U.S. Open women's final took a nosedive after Serena Williams was upset by Roberta Vinci on Friday.

Ticket prices for the U.S. Open women's singles final took a nosedive after Serena Williams was upset by Roberta Vinci on Friday.

Williams was aiming to complete the calendar Grand Slam for the first time since Steffi Graf in 1988. Williams had won four consecutive Grand Slams and three straight U.S. Open titles. 

Before top-seeded Williams lost, tickets for the final averaged $686.90, according to StubHub data. As of Friday afternoon, average tickets for the match had dropped to $366.91. Tickets for the women's final (which also include entry to the men's doubles final) could be found for as low as $75 on the website early Friday evening.

Williams was stunned by Vinci, who is unseeded, in Friday's semifinals. No. 2 Simona Halep also lost, depriving fans of the chance to witness Williams make history and a showdown between the tournament's top two players.

Vinci will face Flavia Pennetta in Saturday's 3 p.m. ET final.

• Watch: Roberta Vinci's post-match interview

- Jeremy Woo