Team GB's Adam Peaty is safely through to the men's 100m breaststroke semifinals after clocking in at 57.56 seconds on Saturday.
Peaty recorded the fastest time in the breaststroke heats as only one other man, Netherland's Arno Kamminga, swam under 58 seconds.
The 26-year-old can cement his status as one of the greatest British athletes of all time in Tokyo by becoming the first in his country to win back-to-back Olympic swimming titles. Peaty is the reigning 100m breaststroke world-record holder, with a time of 56.88 seconds.
- Oladipo: Peaty ready to make Olympic history
"Heats are heats. I always have cobwebs and I had that at exactly the same time in Rio and I always build on that," Peaty said.
"I was a bit shaky off the start, for some reason I was gripping it a bit hard but there's a lot of variables when it comes to an Olympics and it's about controlling as many of them as you can.
"Some you can't control -- we were very delayed tonight and it was very hot, but it's about how we adapt into the semis and then hopefully into the final.
"It was really weird with no crowd, really weird. But those are the psychological things we've got to adapt to. Because there's no crowd, it doesn't feel like an Olympics. It's not the same, of course it's not.
"But obviously when you go back to the village, that's when it does. It's about controlling those emotions and performing when it matters."
The semifinals will take place in the early hours of Sunday morning.
Elsewhere, Team GB progressed into the women's football quarterfinals in Tokyo with a 1-0 victory over hosts Japan on Saturday. Striker Ellen White scored a late header to earn the victory and settle a tough contest.
Rowers Helen Glover and Polly Swann finished off the pace in third in their heat in the women's pair, but it was enough to advance to the semifinals.
Glover has launched a remarkable comeback at Tokyo 2020 after she becomes the first mother to compete for Great Britain in rowing. The two-time Olympic champion retired after winning gold in the women's pair at Rio 2016 alongside Heather Stanning before having three children.
"It wasn't our perfect row but I guess there's value in learning in the early rounds," Glover said after the race. "We're open to what's going to come next.
"It's Logan's birthday today, he's three today. So there are so many more important things going on than just racing a heat in Tokyo.
"There's my little boy at home, we'll celebrate when I get back. When I think about what they all mean to me, especially on a day like his birthday, everything I do out there on the water is definitely for them."
Andy Murray got off to a positive start in Tokyo, winning his doubles tournament opener alongside Joe Salisbury against second seeds Nicolas Mahut and Pierre-Hugues Herbert.
"I think we gelled really well," Murray said in his post-match interview. "We played a good match, had good energy on the court, made lots of good decisions and played solid doubles, so I think we can do well together."
Asked if their preparations would change after knocking out a second-seeded team, Murray said: "I don't think so, you've got to win five matches for a medal. You take one match at a time, so a lot of the players here are really motivated to play for their country.
"This is such a rare opportunity for all of us and I think we all want to do well."
Heather Watson was knocked out of the women's singles after she lost 7-6, (7-5), 6-3 to Germany's Anna-Lena Friedsam.
Team GB's cycling hopes suffered an early blow on Saturday as 2018 Tour de France champion Geraint Thomas withdrew from the road race after he crashed with around 155km to go.
Thomas, who also came off his bike in the road race at Rio 2016, got back on to finish the race, sporting torn clothing and with blood visible on his shoulder, before bowing out. Ecuador's Riachard Carapaz went on to win the gold medal.
All good with me. Thanks for the messages!! Think I must have done something bad in a previous life🤦♂️ Freak crash, Tao lost his front wheel and decked it in front of me. I had nowhere to go, other than the floor as well🤷♂️— Geraint Thomas (@GeraintThomas86) July 24, 2021
Defending Olympic gymnastics champion Max Whitlock made a good start in his bid to reach the pommel horse final, scoring 14.900 points in qualifying to sit in third place. The top eight gymnasts will make the final on Aug. 1.
"Qualifications is a nerve-racking event, the hardest one, because the rest of the Olympic Games rides on that," Whitlock said. "I'm really, really pleased with my events today, because it's been a long time since competing and the preparation [due to COVID-19] has been a bit here and there.
"Hopefully we're advancing to the team final, so we'll prepare for that. Fingers crossed, the pommel horse final [for me] and hopefully clean up those little things."
Team GB's men's hockey team earned a 3-1 win over South Africa in their Tokyo 2020 tournament opener. Goals from Sam Ward, Liam Ansell and Jack Waller sealed the victory, with Canada next up on Monday.
It was heartbreak for British judo and reality TV star Ashley McKenzie, whose Games lasted just four minutes as he was eliminated in the first round of the men's 60kg tournament by Azerbaijan's Karamat Huseynov.
McKenzie funded his own training through reality TV appearances -- he made the 2012 Celebrity Big Brother final, as well as appearing on the first series of Celebs on the Farm in 2018 and Celebrity Ex on the Beach in January 2020.
"It just hurts to see that," McKenzie said after his match. "They've [his family] probably woken up to watch me and I had one fight and it didn't go the way I wanted it to. I just want to go home, that's it."