Radwanska earned a break point with a stunning return .
Muguruza showed no signs of crumbling at 30 - 40 , producing a powerful wide serve before stepping into the net and finishing with a forehand volley .
Radwanska earned a break point with a stunning return , but Muguruza showed no signs of crumbling at 30 - 40 , producing a powerful wide serve before stepping into the net and finishing with a forehand volley .