Federer, William sisters into semis of Miami Tennis

MIAMI: Roger Federer continued his domination of Andy Roddick, this time winning a tough match, topping the former world No. 1 American, 6-3, 4-6, 6-4 to move into the semifinals at Miami Masters Tennis.

The second-seeded Federer, who beat Roddick in this year''s Aussie Open semis, moved to 17-2 lifetime against him. The Super Swiss, who won this event back- to back in 2005 and 2006 and was the runner-up here in 2002, will next meet Serbian Novak Djokovic in the semifinals.

The 2007 Miami titlist Djokovic got past 10th-seeded Frenchman Jo-Wilfried Tsonga 6-3, 6-4 on the hardcourts at Crandon Park Tennis Center.

Serena Williams will take on her sister Venus in the semi-finals after the top seed survived a scare.

The world number one recovered from losing the opening set against Li Na to come through 4-6 7-6 (7-1) 6-2.

Venus Williams, the fifth seed, had an easier time against Czech Iveta Beneseova as she won 6-1 6-4 in Miami.