PRO TENNIS: Djokovic wins 9th Australian Open, 18th Slam title

  • Novak Djokovic kisses the Norman Brookes Challenge Cup after defeating Daniil Medvedev in the men's singles final at the Australian Open on Sunday in Melbourne, Australia. (MARK DADSWELL/Associated Press)
    Novak Djokovic kisses the Norman Brookes Challenge Cup after defeating Daniil Medvedev in the men's singles final at the Australian Open on Sunday in Melbourne, Australia. (MARK DADSWELL/Associated Press)

    MELBOURNE, Australia — Maybe, just maybe, the thinking went, Novak Djokovic would be just a tad more susceptible to trouble this time around at the Australian Open. 

    After all, he tore an abd…