Former world No. 1 Naomi Osaka retired from her Australian Open third-round match Friday with an abdominal injury after losing the first set 7-6(3) to Tokyo Olympics gold medalist Belinda Bencic.The Japanese star dropped her opening service game but broke right back and went on to hold a commanding 5-2 lead against her Swiss opponent before the injury started to have an effect on the sixth day of the Grand Slam event.Osaka's loss left no Japanese in the men's or women's singles draw at Melbourne Park.In other third-round action, top-seeded Belarusian and two-time defending champion Aryna Sa…READ FULL ARTICLE