Reilly Opelka delivered the upset of the week by defeating 24-time Grand Slam champion Novak Djokovic in the quarterfinals of the ATP 250 Brisbane International by 7-6(6), 6-3.
Novak Djokovic celebrates winning by pretending to play the violin on his tennis racquet during the Brisbane International. / IMAGO / AAP No one should be concerned about Novak Djokovic's status ...