Citing a back injury, American Reilly Opelka retired from the Brisbane International final down 1-4 to Jiri Lehecka.

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.

Jiri Lehecka claimed the Brisbane International men's title after Reilly Opelka retired with an injury while trailing 4-1 in the opening set.

Czech tennis player Jiri Lehecka sealed his second ATP title on Sunday after Reilly Opelka was forced to retire in the first set of the Brisbane International final with a back injury. Lehecka led 4-1 when the physically hampered Opelka was forced to stop.

Czech Jiri Lehecka has won the Brisbane International after feelgood story Reilly Opelka retired with a back complaint when trailing 4-1 in the final.