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,

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.

Novak Djokovic will not play any further part in this year's Brisbane International as Reilly Opelka has sealed the biggest win yet of his return to the sport after having most of the last 18 months on the sidelines injured.

Over his legendary tennis career, it has always been foolish to write off 24-time Grand Slam title winner Novak Djokovic.

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.

Former world number one Novak Djokovic's Australian Open preparations suffered a blow Friday as he was bundled out of the Brisbane International by towering American Reilly Opelka.The Australian Open starts on January 12.

TOPSHOT - Winner Reilly Opelka of the United States (R) and Serbia's Novak Djokovic shake hands at ... [+] the net after their men's singles quarter-final match at the Brisbane International tennis tournament in Brisbane on January 3,