World No.1 Novak Djokovic was knocked out in the second round of the Madrid Masters on Tuesday as 21-year-old Grigor Dimitrov produced the performance of his career to date to win 7-6 (8/6), 6-7(8/10), 6-3 in just over three hours. Dimitrov took the first set in controversial circumstances as he benefited from an overrule when serving set-point down at 4-5 before eventually taking it on a tie-break. The Bulgarian then fluffed a match point as the second set also went all the way to a tie-break, but regained his composure to break the Serb twice in the final set to seal it 6-3. From: AFP