Japan's Yoshihito Nishioka reached the fourth round of a Grand Slam tennis tournament for the first time in his career Friday with a straight-sets win over Mackenzie McDonald of the United States at the Australian Open.The 31st-seeded, left-handed Nishioka won 7-6(6), 6-3, 6-2 at Melbourne Park, converting six of 16 break points while being broken twice. McDonald, who upset injured Rafael Nadal in the second round, made 53 unforced errors against 33 for Nishioka.In the fourth round, Nishioka will face 18th-seeded Russian Karen Khachanov, a 6-3, 6-4, 3-6, 7-6(9) winner over the 16th seed, Am…READ FULL ARTICLE