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

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.

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

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

Alex Michelsen produced the biggest win so far of his fledgling career to upset 2023 runner-up Stefanos Tsitsipas in the first round of the Australian Open and the first person he credited was his mom.