Mackenzie McDonald KOs Rafael Nadal in Australian Open's 2nd round

Mackenzie McDonald knocked out defending champion Rafael Nadal in the second round of the Australian Open on Wednesday (Australia time), rolling to a 6-4, 6-4, 7-5 victory in Melbourne.

Nadal, the tournament's top seed, hadn't exited a Grand Slam event this early since falling in the first round of the 2016 Australian Open. The 36-year-old Spaniard has a men's-record 22 Grand Slam titles, including two last year, the Aus