Here's what Reilly Opelka told Novak Djokovic at the net after his stunning upset win vs. the World No. 7 at the Brisbane International.

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.