American Learner Tien kept the teenage revolution going at the Australian Open by reaching the fourth round on Saturday after 38-year-old Gael Monfils had made a big statement for the old guard with a stunning win over fourth seed Taylor Fritz.

Gael Monfils has joined Roger Federer as the only men to reach the Australian Open’s fourth round at age 38 or older since the tournament field expanded to 128 players in 1988

The future of men’s tennis has been on show at the Australian Open but Gael Monfils struck a major blow for the old guard with victory over fourth seed Taylor Fritz. Frenchman Monfils is only the second player aged 38 or over,