US Open: Naomi Osaka reaches third round

Defending champion Naomi Osaka returned to the third round of the U.S. Open on Wednesday when her opponent withdrew because of illness. Osaka had been scheduled to face Olga Danilovic of Serbia in the first match of the day at Arthur Ashe Stadium. Instead, the U.S. Tennis Association moved the match between women's No. 12 seed Simona Halep and Kristina Kucova into that spot. 

Earlier, Djokovic brushed aside the resistance of Holger Rune in Arthur Ashe Stadium as he defeated teenager by 6-1, 6-7, 6-2, 6-1, to start his charge for a perfect Grand Slam season at US Open.