Jelena Jankovic Suffers Shock Defeat in US Open Last 16

Swiss teenager Belinda Bencic dismissed former world number one Jelena Jankovic 7-6 (8/6), 6-3 on Sunday to reach the quarter-finals of the US Open. (Read: Wozniacki Beats Sharapova)

Bencic, 17 and ranked 58th in the world, became the youngest US Open quarter-finalist since Martina Hingis won the title in 1997 at the age of 16. (Federer Advances | Ferrer Ousted)

Hingis, whose mother Melanie Molitor is one of Bencic's coaches, was courtside for the match, lending a little moral support to her young compatriot, who was the 2013 junior title at Wimbledon and Roland Garros but hadn't made it past the third round in three major main draw appearances this year.

She next faces China's Peng Shuai, a 6-3, 6-4 winner over 14th-seeded Lucie Safarova.