A look ahead to the Australian Open for Tuesday, and a Monday recap

Six-time champion Novak Djokovic was upset in straight sets by Hyeon Chung not long after Tennys Sandgren beat No. 5 Dominic Thiem at the Australian Open

Sixth-seeded Karolina Pliskova has advanced to the Australian Open quarterfinals with a 6-7 (5), 6-3, 6-2 win over No. 20 Barbora Strycova

After Nick Kyrgios dropped the first two sets to Grigor Dimitrov in their tense, back-and-forth fourth round match at the Australian Open, a spectator called out to him as he dejectedly walked back to the service line, "Pick your head up."

Top-ranked Rafael Nadal and No. 3 Grigor Dimitrov advanced to the Australian Open quarterfinals in tough four-setters on Sunday. Nadal beat Diego Schwartzman to reach the quarterfinals here for the 10th time; Dimitrov ended Australia's hopes.

A look ahead to the Australian Open for Monday, and a Sunday recap

Fourth-seeded Elina Svitolina started her fourth-round match just before midnight Sunday at the Australian Open and was finished within an hour, beating Czech qualifier Denisa Allertova 6-3, 6-0 to reach the quarterfinals here for the first time

Angelique Kerber is the only major winner remaining in the Australian Open women's draw after ending Maria Sharapova's comeback tour to Melbourne Park

Alexander Zverev continues puzzling early exits at Grand Slams, losing to Hyeon Chung in third round of Australian Open

A lookahead to the Australian Open for Sunday, and a Saturday recap