Jack Sock wins at ATP World Tour Finals despite 4am fire alarm

Horford leads way as Celtics win 12th straight

Horford leads way as Celtics win 12th straight

5-7, 6-1 to cement his place in the last four at the O2 Arena in London.

"It was a good battle and I always enjoy myself at this handsome arena", said Federer, who has now reached the semi-finals 14 times. "I think if I do the right things and I play the right tennis, I can give myself a chance to play on the weekend of any tournament".

"Thank you for making it such a special night".

"It is frustrating, absolutely, at the beginning of the third set I played well", Cilic said.

"It's been a tough group so to be through in two matches is great".

Both players could ill afford another defeat after losing their first matches at the O2 Arena and there was a sense of deja vu for Cilic, who led Alexander Zverev 3-1 in the final set of his opening contest before being consigned to defeat.

But Zverev went to pieces in the tie-break, only to fight back from 2-0 down in the second, capitalising on a noticeable Federer dip including five consecutive missed serves.

After those two games, the match zipped along at a rate of knots with barely 35 minutes having passed before Zverev was serving to try to force a tie-break.

Zverev has been touted as the leader of a pack of young players hungry to oust the creaking old guard but Federer, who has suffered only four defeats all year, shows no sign of slipping.

Roger Federer unquestionably beat Jack Sock during his opening ATP Finals match, but he also sprang a major goof when he totally dorked what should've been an easy forehand.

"It's been an interesting morning so far", said the American. "I play a different style and there's always a lot going on, I don't even know what I'm going to do sometimes, it keeps it fun". It's an wonderful atmosphere here and I love playing in London and in front of the fans here.

The top two players from each of the two groups of four progress to the semi-finals.

Nadal, who certainly enjoys playing on clay, had earlier vented his frustration about the hard-court surface at the ATP Finals and suggested that it would be better if the season-ending event at least occasionally took place on his preferred surface.

With Novak Djokovic and Andy Murray sidelined through injury, Federer is the only genuine star left in London and is the clear favorite to lift his seventh year-end title at the grand old age of 36.

Altre Notizie