Sharapova tested as Radwanska falls

Maria Sharapova survived an attritional battle against Romania’s Alexandra Dulgheru to reach the third round of the US Open but Agnieszka Radwanska became the first major casualty.

Sharapova paid the price for an erratic display in the first set and needed two hours and 38 minutes to grind out a 4-6 6-3 6-2 win over world number 95 Dulgheru.