Agnieszka Radwanska eases through in Miami

Agnieszka Radwanska has eased through to the third round of the Sony Ericsson Open in Miami, Florida, following a straight-sets victory over Madison Keys.

The world number five was ruthless in the first set as she broke her American opponent three times on her way to taking the set 6-1.

It was more of the same in the second as Radwanska pinned her opponent back with a succession of powerful strokes.

The Pole found two breaks of serve as she claimed the set 6-1 again to secure the win.