Ana Ivanovic wins ugly

Former world number one Ana Ivanovic has knocked 19-year-old American Sloane Stephens out of the US Open at the third-round stage for the second consecutive year.

The 12th seed was far from at her best and made 56 errors before eventually prevailing 6-7 6-4 6-2 in 141 minutes.

Stephens, who is ranked 44th in the world, made 10 double faults.

Ivanovic will be aiming to reach her first Grand Slam quarter-final since 2008 when she faces Tsvetana Pironkova in round four.