Novak Djokovic was beaten 7-6 (6), 6-3 by big-serving Reilly Opelka in the Brisbane International quarterfinals on Friday.The 37-year-old Djokovic was playing his first tournament of the year. The 24-time Grand Slam champion is preparing for the Australian Open,

Novak Djokovic's hunt for a landmark 100th ATP title ended with a whimper following an unexpected 7-6(6) 6-3 defeat by big-serving American Reilly Opelka in the Brisbane International quarter-finals on Friday.

Djokovic is in search of his 25th Grand Slam title at the Australian Open, but fell short of the semifinals at his warm-up event.