Paul survived a comeback bid by Australia’s Chris O’Connell in front a feverishly partisan crowd; the American tightened up when he served for the match in the fourth set, then fought through a shoulder injury to take the decider 7-5. Nishikori, meanwhile, came back from two sets down, and saved two match points, against Thiago Monteiro.

Tommy Paul has ended Alejandro Davidovich Fokina’s run of comebacks at the Australian Open and reached his third Grand Slam quarterfinal with a 6-1, 6-1, 6-1 victory