Tennis - Bellis, 15, loses out on $60,000 for US Open stunner

Tennis - Bellis, 15, loses out on $60,000 for US Open stunner
NEW YORK, NY - AUGUST 26: Catherine Bellis of the United States celebrates after defeating Dominika Cibulkova of Slovakia during their women's singles first round match on Day Two of the 2014 US Open at the USTA Billie Jean King National Tennis Center on August 26, 2014 in the Flushing neighborhood of the Queens borough of New York City. Streeter Lecka/Getty Images/AFP (AFP Photo/STREETER LECKA)

- Fifteen-year-old CiCi Bellis caused the biggest upset of the US Open on Tuesday when she knocked out Australian Open runner-up Dominika Cibulkova, the 12th seed -- but it cost her $60,000.

Bellis, the world 1,208, defeated the Slovakian 6-1, 4-6, 6-4 to become the youngest player to win a match at the US Open since Anna Kournikova in 1996.

But with the home-schooled Californian looking to the future and a college education, she was unable to claim the $60,420 prize money guaranteed for reaching the second round which would have contravened her amateur status.

"I think I'm definitely going to stay an amateur right now to keep my options open for college, in case an injury or something happens. But I'd love to be a pro one day," said the girl from northern California.