Hi, Mom! 20-year-old Californian Alex Michelsen beats a second top-20 seed at the Australian Open Alex Michelsen of the U.S. gestures during his third round match against Karen Khachanov of Russia at the Australian Open tennis championship in Melbourne, Australia, Saturday, Jan. 18, 2025. (AP Photo/Ng Han Guan)
Alex Michelsen of the U.S. plays a backhand return to Karen Khachanov of Russia during their third round match at the Australian Open tennis championship in Melbourne, Australia, Saturday, Jan. 18, 2025. (AP Photo/Ng Han Guan)
Alex Michelsen of the U.S. reacts after defeating Karen Khachanov of Russia in their third round match at the Australian Open tennis championship in Melbourne, Australia, Saturday, Jan. 18, 2025. (AP Photo/Ng Han Guan)
Karen Khachanov of Russia reacts during his third round match against Alex Michelsen of the U.S. at the Australian Open tennis championship in Melbourne, Australia, Saturday, Jan. 18, 2025. (AP Photo/Ng Han Guan)
Alex de Minaur of Australia celebrates after defeating Francisco Cerundolo of Argentina in their third round match at the Australian Open tennis championship in Melbourne, Australia, Saturday, Jan. 18, 2025. (AP Photo/Asanka Brendon Ratnayake)
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Alex Michelsen of the U.S. gestures during his third round match against Karen Khachanov of Russia at the Australian Open tennis championship in Melbourne, Australia, Saturday, Jan. 18, 2025. (AP Photo/Ng Han Guan)