Roger Federer squandered three match points and fell to a shock 3-6, 7-6 (9/7), 7-6 (7/5) defeat at the hands of Russian world number 116 Evgeny Donskoy in Dubai on Wednesday.
Former world number one Federer, who lifted his 18th Grand Slam title at the Australian Open in January, had match points in the second set of the second-round tie and also led 5-1 in the third-set tiebreak.