Highlights of the fifth day of the Australian Open on Thursday (all times GMT): 1554 TEENAGER TIEN STUNS MEDVEDEV American qualifier Learner Tien held his nerve in a battle that lasted four hours and 49 minutes to stun Russian fifth seed Daniil Medvedev,

“The AO is something that connects really well with New Balance because the mix of sport and culture they have is incredible,” Evan Zeder, New Balance director of global sports marketing for tennis, tells me. “I think the AO is a perfect mix and it is just a big party.”

Australian Open is showcasing a crop of young men's players who are better equipped for the changes in tennis than their elders.

Learner Tien has stunned the tennis world, claiming an upset victory over Daniil Medvedev at the Australian Open.

Learner Tien has become the youngest American man to reach the Australian Open’s third round since Pete Sampras in 1990

American teenager Learner Tien produced arguably the biggest shock of the Australian Open so far as he defeated last year’s runner-up Daniil Medvedev in five sets, 6-3, 7-6 (4), 6-7 (8), 1-6, 7-6 (7).

Danielle Collins thanked a hostile Australian Open crowd for helping to fund her next vacation after beating its last home hope in the women’s draw. Collins beat Destanee Aiava 7-6(4), 4-6, 6-2 to set up a third-round meeting with U.