US Open day two RE-LIVE: Naomi Osaka crashes out; Defending champ 'happy' to lose; Rafael Nadal's touching moment for Aussie young gun

If you're looking for day three live coverage of the US Open, click here!

Alternatively, you can catch up on all the action from day two by scrolling below.

Another big day at Flushing Meadows, highlighted by Aussie young gun Rinky Hijikata pushing Rafael Nadal in an entertaining four-set encounter.

We'll be back to cover the day three action from 5am Wednesday.

See you then!

Japanese champion Naomi Osaka has recorded her worst US Open result by exiting in the first round to American No.19 seed Danielle Collins.

Osaka, still only 24 years old, won at Flushing Meadows in 2018 and 2020. She also has two Australian Open titles to her name.

But on Tuesday she crashed out in a 7-6 (7-5), 6-3 defeat to Collins on Arthur Ashe Stadium.

Osaka also lost her first-round match at Roland-Garros earlier this year, and missed Wimbledon entirely.

Collins had previously never won a set against Osaka.

"When you lose to someone three times, you get a lot of information on what you can do better," Collins said.

"With Naomi being the player she is she definitely whooped me the last time, so I have to go out and learn from that and make adjustments."

American No.19 seed Danielle Collins has beaten two-time US Open champion Naomi Osaka in the first round.

Collins had never taken a set off the Japanese star in their two previous meetings, but did it convincingly today to win 7-6 (75), 6-3.

A fantastic match, particularly for the opening round.

American men's player Jack Sock has been forced to retire injured from his first-round match against Diego Schwartzman.

Sock won the first two sets, but then was badly hampered and surrendered with the match poised at 6-3, 7-5, 0-6, 0-1.

Emma Raducanu became only the third defending US Open champion to lose in the first round, eliminated by Alizé Cornet 6-3, 6-3.

Raducanu, who was 18 and ranked 150th when she won the title as a qualifier a year ago, was bothered by hand blisters — she took a medical timeout for treatment after the first set — and was outplayed by Cornet, a 32-year-old from France who also upset No.1 Iga Swiatek at Wimbledon.

"Obviously really disappointing. Really sad to leave here. It's probably my favorite tournament. But also, I mean, in a way, (I'm) happy, because it's a clean slate," Raducanu said.

"I'm going to drop down the rankings. (Will) climb my way back up."

Naomi Osaka scores the first break of the second set, just as she did in the first.

Danielle Collins won the first set but finds herself down in the second against the former US Open champion.

We've got an epic first-round clash on our hands here at Arthur Ashe Stadium.

Danielle Collins wins the first set in a tiebreak after both players broke early.

It is the first time she has ever won a set against Japanese champion Naomi Osaka.

The unseeded former US Open champion Naomi Osaka got the early break and was up 3-1 in the first set.

But No.19 seed Danielle Collins broke back and it's now on serve.

Some powerful tennis and big shots from both players, this is a cracker.

We're ready to get underway for the last match of the day on Arthur Ashe Stadium.

Women's No.19 seed Danielle Collins goes up against Japanese champion Naomi Osaka.

Stay tuned for updates.