LONDON — Rafael Nadal and Novak Djokovic completed the semifinal lineup at the ATP World Tour Finals with straight-set victories Friday.

LONDON — Rafael Nadal and Novak Djokovic completed the semifinal lineup at the ATP World Tour Finals with straight-set victories Friday.

The top-ranked Nadal beat Tomas Berdych 7-6 (3), 6-1 in the early match to leave Djokovic needing only one set to finish second in Group A and the third-seeded Serb defeated a listless Andy Roddick 6-2, 6-3.

Nadal will meet Andy Murray in today's opening semifinal as he bids for his first title at the end-of-season tournament. Djokovic plays Roger Federer.

Roddick began his match against Djokovic with an outside chance of reaching the semifinals but the eighth-ranked American was never in contention and was broken three times in a 65-minute loss.

Nadal, meanwhile, finished Group A with a 3-0 record and appears finally to be getting to grips with the surface at the O2 Arena, having lost all three matches on the same court last year.

It wasn't all plain sailing for Nadal, who lost his cool momentarily and argued furiously with the officials in the first set.

Roddick, who had qualified for the eight-man tournament for the eighth straight year, leaves London with an 0-3 record after a surprisingly lackluster performance.

The 28-year-old American had won his last four matches against Djokovic and engineered a break point in the opening game, only to put a backhand into the net.

Roddick failed to threaten again.