By Ian Ransom MELBOURNE (Reuters) -Teenage qualifier Learner Tien became the youngest man to reach the Australian Open fourth round in 20 years as the future of American tennis lit up Melbourne Park on Saturday.

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

Gael Monfils rolls back the years to oust fourth seed Taylor Fritz and reach the Australian Open fourth round.

American Learner Tien kept the teenage revolution going at the Australian Open by reaching the last 16 on Saturday after 38-year-old Gael Monfils had made a statement for the older player with a stunning upset of fourth seed Taylor Fritz.