Alex Michelson has reached the fourth round at a Grand Slam tournament for the first time. He got there with a 6-3, 7-6 (5), 6-2 victory over No. 19 seed Karen Khachanov of Russia at the Australian Open on Saturday.

There are three American men aged 23 and under in the second week of a Grand Slam. That hasn't happened since 2003

Alex de Minaur's Australian Open fourth-round opponent Alex Michelsen has a hip injury he received a medical timeout for in his previous match.

Two friends from California, Learner Tien and Alex Michelsen, have both reached the fourth round at the Australian Open. Tien is 19, and Michelsen is 20.

Two of four American men still playing in Melbourne, Irvine native Tien, 19, and Aliso Viejo native Michelsen, 20, became friends on the youth tennis circuit