Grigor Dimitrov qualified for the semifinal of the ATP Masters in Rome, after Tommy Haas retired before the start of the second set.
The Bulgarian took the first set 6:2 in just over half an hour, completely dominating his experienced opponent.
In the break between the sets, the 36-year-old German decided to pull out, most likely due to some pain that had been troubling him.
MIAMI - Serbia's highest-ranked male tennis player Novak Djokovic reached the semi-finals of the Miami Masters tournament by beating title holder Andy Murray of Great Britain 7-5, 6-3 late Wednesday.
In a bid to reach the final, Djokovic will face the winner of the match between Roger Federer of Switzerland and Kei Nishikori of Japan.
NEW YORK - Serbia's best tennis player Novak Djokovic beat Britain's Andy Murray in the exhibition match in New York late on Monday, 6-3, 7-6 (7-2).
The match was played in the Madison Square Garden Hall within the celebration of World Tennis Day.
Other exhibition matches were held in London and Hong Kong.