Novak Djokovic must go back to the drawing board after suffering a recurrence of his elbow problems in a fourth-round loss to Chung Hyeon at the Australian Open.

Caroline Wozniacki's 2018 season has the chance to pick up where 2017 ended after she booked her place in the ASB Classic final in Auckland.

Serena Williams and Maria Sharapova both shook off recent injury problems to sail into the Australian Open third round with straight-set victories.

Rafael Nadal recovered from the shock of losing the first set of his French Open title defence to world No 59 Daniel Brands by battling into the second round at Roland Garros.

Top seed Nadia Petrova moved into the second round of the Korea Open with a comfortable 6-3 6-2 victory over Jarmila Groth of Australia in Seoul.