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Defending champion Dimitrov loses to Muller in 2nd round at Queen's Club

  • John Isner of the United States serves to Spain's Feliciano Lopez during their singles tennis match at the Queen's Championships in London, Thursday, June 18, 2015. (AP Photo/Tim Ireland)

    John Isner of the United States serves to Spain's Feliciano Lopez during their singles tennis match at the Queen's Championships in London, Thursday, June 18, 2015. (AP Photo/Tim Ireland)  (The Associated Press)

  • Serbia's Viktor Troicki celebrates taking the second set from Croatia's Marin Cilic during their singles tennis match at the Queen's Championships in London, Thursday, June 18, 2015. (AP Photo/Tim Ireland)

    Serbia's Viktor Troicki celebrates taking the second set from Croatia's Marin Cilic during their singles tennis match at the Queen's Championships in London, Thursday, June 18, 2015. (AP Photo/Tim Ireland)  (The Associated Press)

Defending champion Grigor Dimitrov lost 6-4, 7-6 (5) to Gilles Muller of Luxembourg in the second round at Queen's Club on Thursday.

The sixth-seeded Bulgarian won the title last year by defeating Feliciano Lopez, but he has failed to reach a final since. He was bidding to successfully defend a title for the first time in his career.

In a match of few rallies in which Muller had 19 aces and Dimitrov 15, the Bulgarian double-faulted at 5-4 in the first set and then made a forehand error to give Muller the only break of the match and a 1-0 lead.

Dimitrov saved a break point at 2-1 in the second with a backhand winner down the line, but Muller was stronger in the tiebreaker.