Wimbledon: Novak Djokovic will face Tomas Berdych in the quarter-finals
Novak Djokovic remained on course for the Wimbledon final after beating Tommy Haas in their fourth round match.
Last Updated: 01/07/13 9:27pm
Djokovic cruised through the first set but had his serve broken twice thereafter before winning 6-1 6-4 7-6 in two hours and 12 minutes.
The top seed will face former finalist Tomas Berdych in the last eight after the Czech overcame the challenge of Bernard Tomic 7-6 6-7 6-4 6-4.
Like Andy Murray in the other half of the draw, Djokovic has yet to drop a set in this year's tournament as the pair made serene progress on Monday.
The Serb required just 25 minutes to notch the first set against the veteran Haas, but the German finally gained a foothold by breaking in the fifth game of the second set.
However, Djokovic broke back to level at 4-4 with a cross-court backhand winner and a further break saw him double the advantage.
The former champion looked to be cruising as he moved into a 5-2 lead in the third but 35-year-old Haas would not go down without a fight, breaking back before forcing a tie-break.
But with the light starting to fade Djokovic wrapped up the win 7-4 to progress to a last-eight clash with Berdych, over whom he holds a 13-2 record.
"Haas is always a tough opponent," admitted Djokovic. "I had lost to him twice on grass before. He has great variety in his game and I always knew it would be a tough challenge.
"It was never going to be easy. I had to work for my games but I served well and returned well. I am happy to have closed it out in straight sets."
Berdych's match with Tomic was dominated by serve as they shared the first two sets, before the seventh seed broke twice to move ahead again in the third.
Chances were few and far between in the fourth set but again it was the more-experienced Berdych who gained the crucial break to clinch victory.
"It's tough to play him so it makes me feel even better to be here as a winner," said the Czech, who beat Djokovic on the way to the final here in 2010. "But after the first two sets I felt much more confident."