Radwanska makes early exit from Sydney International

Top seed and defending champion Agnieszka Radwanska of Poland has been knocked out of the Apia International Sydney tennis tournament by American qualifier Bethanie Mattek-Sands.

After falling behind 0-3 in the first set, Mattek-Sands settled into the contest and began to dominate the match with her superior power at the Sydney Olympic Park, claiming a 7-5, 6-2 victory over Radwanska.

It was Mattek-Sands' fifth win after coming through the qualifying draw.

The 28-year-old American moves into a quarter-final clash against either fellow American Madison Keys or wildcard Ajla Tomljanovic of Croatia.