Djokovic into semis as US Open books Monday finish

Top seed Djokovic, the runner-up in 2007 and 2010, booked his place in a fifth successive semi-final yesterday when Serbian Davis Cup-winning teammate Janko Tipsarevic retired with a left thigh injury.

Djokovic, who was 7-6 (7/2), 6-7 (3/7), 6-0, 3-0 ahead at the time, will face either five-time champion Roger Federer or Frenchman Jo-Wilfried Tsonga for a place in the final.

That title match will now be played on Monday after besieged organisers surrendered their desperate attempts to shoehorn the remainder of the tournament, which had seen Tuesday and Wednesday washed out, into four days.

The women's final will take place on Sunday instead of Saturday with both men's and women's semi-finals on Saturday.

Djokovic claimed his 62nd win of 2011 when Grand Slam quarter-final debutant Tipsarevic's brave bid was undone by a thigh injury in the third set.

The top seed had clinched a marathon 90-minute first set before Tipsarevic levelled the tie.

But that was as good as it got for the 27-year-old who didn't win another game with Djokovic even surviving a toe injury he collected while performing a spectacular running, crosscourt winner at the start of the fourth set.

"I sensed early in the third set when I got a break that he lost some pace on his serve and he wasn't moving as well," said Djokovic, who backed the decision to stage the final on Monday.

"For the top half of the draw maybe it would have been easier because we played our fourth round on Monday."

US Tennis Association officials extended the tournament after leading stars such as Rafael Nadal, Andy Murray and Andy Roddick, who were all facing playing on four consecutive days to make a Sunday final, protested over the schedule.

"The matches, quarter-finals, semi-finals, four rounds of a Grand Slam normally are tough matches. If you don't have rest, you have a big chance not be fit enough in the next match," said Nadal, who reached the last eight with a 7-6 (7/1), 6-1, 6-3 win over Gilles Muller, a match that was slated for Tuesday.

In contrast, title rivals Djokovic and Federer had both completed their last-16 matches on Monday.

Murray, who made the last eight with a 6-2, 6-3, 6-3 win over America's Donald Young, believes the players need more power at the Grand Slams.

When asked if commercial interests -- with broadcasters ESPN holding the TV rights on weekdays and CBS leading the way at weekends -- held more sway than the players, Murray said simply: 'Yes'."

Jim Curley, the US Open tournament director, said the decision to push back the final to Monday had been taken to satisfy all interests.

"We revised the schedule in an effort to be fair to the players and our ticketholders," said Curley.

"This is the result of a collaborative effort with the players, CBS Sports and tournament officials to address the issues that arose from the inclement weather earlier this week."

Roddick, the 2003 champion, had grabbed the headlines earlier in the day when his last-16 clash against David Ferrer was suspended because of water seeping up through a crack in the surface on Louis Armstrong Stadium.

After playing just two games of their resumed match, the players were taken off court as groundstaff tried desperately for 80 minutes to soak up the water despite the tie being played in bright sunshine.

When Roddick and Ferrer returned, the 29-year-old American was furious, telling besieged referee Brian Earley that the surface was still too wet to play.

He packed his bag and stormed off to jeers from the crowd.

"Why are we here if there is water there?" asked a furious Roddick.

"I'm getting really pissed off. Jesus, what are we doing here. It's killing me. I am baffled right now."

The match was switched to the more condensed Court 13 as officials kept up their bid to clear the backlog.

The switch didn't affect Roddick, who hadn't played on that court since his junior days in 1999, as he completed a 6-3, 6-4, 3-6, 6-3 win over fifth-seeded Ferrer and next faces Nadal.

Murray's reward is a quarter-final match against giant American John Isner.