London, July 2: Novak Djokovic and Andy Murray edged closer to an epic Wimbledon final showdown on Monday while Poland played Grand Slam gatecrashers by guaranteeing at least a semi-final spot.

World number one Djokovic, the 2011 champion, dropped his serve for the first time at this year's tournament before beating Tommy Haas, the 35-year-old German 13th seed, 6-1, 6-4, 7-6 (7/4) in the fourth round.

Djokovic will be playing in his 17th successive Grand Slam quarter-final where he will face Tomas Berdych, the seventh seed and 2010 runner-up, who beat Australia's Bernard Tomic, 7-6 (7/4), 6-7 (5/7), 6-4, 6-4.

Djokovic boasts a 13-2 career record over Berdych but lost to him at Wimbledon in 2010.