Highlights of the eighth day of the Australian Open on Sunday (times GMT): 0030 FOURTH ROUND ACTION UNDERWAY AT MELBOURNE PARK The fourth round of the Australian Open got underway as matches started on schedule to kick off the second week of the year's first Grand Slam.

Iga Swiatek, of Poland, plays a backhand return to Rebecca Sramkova, of Slovakia, during their second round match at the Australian Open on Thursday in Melbourne.

For the first time in her professional tennis career, Emma Navarro has advanced to the fourth round of the Australian Open. For the third match in a row at this

Novak Djokovic of Serbia reacts after winning a point against Tomas Machac of the Czech Republic during their third round match at the Australian Open tennis championship in Melbourne, Australia, Friday,

Novak Djokovic called Danielle Collins' feisty reaction to Australian Open hecklers "funny" and "smart" after himself getting riled up during his third-round win on Friday.