Defending champion Naomi Osaka beat China's Zheng Saisai in straight sets on Wednesday to reach the third round of the women's singles at the Australian Open.The Japan-born world No. 4 defeated the 42nd-ranked Zheng 6-2, 6-4 in 1 hour, 20 minutes at Margaret Court Arena in Melbourne. She will face 15-year-old American Coco Gauff in a rematch of last year's U.S. Open third round.Osaka started the match in good form, claiming four straight games in the first set after allowing Zheng to level at 2-2. However, the following set proved a test for the two-time Grand Slam champion.Zheng broke Osak…READ FULL ARTICLE
