Updated: Wednesday, 27 August 2014 05:43 | By Agence France-Presse

Bellis, 15, stuns Cibulkova at US Open

Fifteen-year-old Cici Bellis, the world number 1,208, caused the biggest upset of the US Open on Tuesday when she knocked out Australian Open runner-up, Dominika Cibulkova, the 12th seed.

Bellis, 15, stuns Cibulkova at US Open

Slovakia's Dominika Cibulkova returns at the 2014 Wimbledon Championships at The All England Tennis Club in Wimbledon, southwest London, on June 27, 2014 - by Glyn Kirk

Bellis 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.

Playing just her 13th pro-level match, the American teenager won a wildcard into the US Open by winning the US under-18 championships.

The home-schooled teenager from the wine-growing Napa Valley in northern California was making her WTA Tour debut and before Tuesday had never met a player ranked inside the top 100.

She will next face either Kazakhstan's Zarina Diyas or Lesia Tsurenko of Ukraine for a place in the last 32.

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