The five-time winner Venus Williams marched into the semi-finals of the Wimbledon Championships Tuesday without the loss of a set so far, pounding out a 6-1, 6-2 defeat of 11th seed Agnieszka Radwanska.

The American winner will face the winner from top seeded world number one Dinara Safina and German teenage challenger Sabine Lisiki. 

The third-seeded Williams needed little more than an hour on court in the sun on a day when British "heatwave" conditions were forecast to touch 33°Celsius to peg back Radwanska.

Williams will be playing in her eighth semi-final at the All England club over the past decade as she won her 19th match in a row at the venue. She has claimed 32 consecutive Wimbledon sets since 2007 third round. 

"I'm in the semi-finals, it's right where I want to be and I'm looking to take it a step further,’ said Venus. 

Williams continues to play with her left knee heavily strapped, but the problem is not affecting her mobility. 

Radwanska was playing in her third Grand Slam quarter-final after first achieving the level in Australia in 2008 and last year at the All England club. 

Venus Williams broke five times on her way to the convincing victory.