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

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

Jannik Sinner will face his trickiest test yet at the Australian Open when the defending champion battles Dane Holger Rune in the fourth round on Monday, while five-times Grand Slam winner Iga Swiatek will be the heavy favourite against lucky loser Eva Lys.

MELBOURNE: Defending champion Jannik Sinner raced to victory at the Australian Open on Saturday to sweep into the last 16 as Iga Swiatek demolished Emma Raducanu. Also into the second week is 38-year-old Gael Monfils after he stunned fourth seed Taylor Fritz - with the veteran's wife Elina Svitolina also enjoying a shock win immediately after on

Tommy Paul has ended Alejandro Davidovich Fokina's run of comebacks at the Australian Open and reached his third Grand Slam quarterfinal with a 6-1, 6-1, 6-1 victory.

Alexander Zverev has reached the Australian Open quarterfinals for the fourth time and will face Tommy Paul next

World number two Alex Zverev overcame a mid-match wobble and the baseline power of Ugo Humbert to reach the Australian Open quarter-finals with a 6-1 2-6 6-3 6-2 win on Sunday. Zverev was knocked off his stride in the second set by the lefthanded Frenchman,