The Latest: Rafa into 4th round in Australia; back seems OK
He reached the fourth round at Melbourne Park for the 14th time in 16 trips. The top-seeded Australian beat Ekaterina Alexandrova of Russia 6-2, 6-4 to reach the fourth round of the Australian Open for the third straight year. The seventh-seeded Rublev will meet Casper Ruud of Norway in the fourth round. 5 seed Stefanos Tsitsipas beat Mikael Ymer of Sweden 6-4, 6-1, 6-1 in the third round. ___3:35 p.m.Unseeded American Mackenzie McDonald has matched his best Grand Slam result by reaching the round of 16 at the Australian Open.