Twice former champion Serena Williams produced her best display at Wimbledon this year to wallop Bethanie Mattek 6-3 6-3 in their all-American fourth round match on Monday.

Williams followed her sister Venus on to Court Two and into the quarter-finals where she will meet either fourth seed Svetlana Kuznetsova of Russia or Polish 14th seed Agnieszka Radwanska.

The sixth seed, seeking her first singles title here since 2003, was in ominous form, breaking world number 69 Mattek in the first and final games to take the first set.

In the second set the 26-year-old Williams again broke her unseeded opponent twice, in the first and third games, to race to victory in just over an hour.