By Sam Blacker on SwimSwam
2025 World Championships
July 27 – August 3, 2025 (pool swimming) Singapore, Singapore World Aquatics Championships Arena LCM (50m) Meet Central How To Watch SwimSwam Preview Index Entry Book Live Results Live Recaps Prelims: Day 1 | Day 2 | Day 3 | Day 4 Finals: Day 1 | Day 2 | Day 3We certainly had our expectations for the final of the mixed medley relay shaken up this morning. Olympic champions USA were three-tenths outside making the final in 10th, and fellow Paris finalists Great Britain and France joined them in failing to make the top eight.
With China not in domineering form and every other nation having at least one weaker leg, the medals could realistically go to any one of five or six countries. The lineup decisions could make a bigger difference to the podium than ever before.
Flying splits from Singapore are used where available. Where these are not, we have used the swimmer’s best individual time from Singapore with half a second taken off (*), or their season-best with half a second taken off (**).
Mixed 4×100 Medley Relay
Italy
There are two locks for the Italians – Thomas Ceccon on backstroke, on what is his first day with no individual swims, and Sara Curtis on freestyle.
The middle two legs are likely to be a male breaststroker and then Constanza Cocconcelli on fly, but with Martinenghi reportedly suffering slightly from illness, it could be Ludovico Viberti instead of the 100 breast silver medalist. In that case, the season-best difference between a Bottazzo-Burdisso lineup and a Viberti-Cocconcelli one is just over half a second – likely enough but not a certainty.
They did go Viberti-Cocconcelli this morning as they progressed in 1st from the heats, but neither has a swim this evening and they both had solid splits.
Something that does tip the scales even more in favor of the latter is that Burdisso has the 200 fly final tonight, his first since Tokyo in 2021. That does come in the middle of the session and an hour before the relay, but the lure of clean water at halfway, and the opportunity to road-test the front half of the suddenly podium-threatening men’s medley relay, may be too enticing to ignore.
With a medal on the table, expect Ceccon to sub in for Bacico as they try to win their first ever medal in this event.
A quick note on the young backstroker – after coming in with a best of 53.42, Bacico has now been 52.72, 52.72 and 52.68 in Singapore. That is huge for Italy’s depth and ability to rest Ceccon.
Backstroke Breaststroke Butterfly Freestyle Cumulative Option 1 Thomas Ceccon – 51.90 Ludovico Viberti – 58.39* Costanza Cocconcelli – 57.24** Sara Curtis – 52.51** 3:40.04 Option 2 Thomas Ceccon – 51.90 Anita Bottazzo – 1:05.11* Federico Burdisso – 51.05** Sara Curtis – 52.51** 3:40.57 Option 3 Thomas Ceccon – 51.90 Nicolo Martinenghi – 58.08** Costanza Cocconcelli – 57.24** Sara Curtis – 52.51** 3:39.73Netherlands
The Netherlands could well be a major player, although their ideal lineup right now would have Marrrit Steenbergen on both backstroke and freestyle. As that sadly is not allowed, there are two options for them tonight
Option 1 would be Maaike de Waard on backstroke, with Steenbergen on the anchor leg where she will hope to reprise her massive 51.64 anchor leg on Day 1 that dragged the women’s 4×100 free relay from 8th to bronze. The second is Steenbergen on backstroke, with 53.1 swimmer Milou van Wijk on the freestyle.
They may lean towards the former, after Steenbergen was just 59.86 individually, well off her best of 58.96. De Waard was actually faster than that this morning, clocking a time of 59.72 to come within a tenth of her best.
The middle two legs are both locks. Caspar Corbeau, who was 59.0 in heats and the final of the men’s 100 breast, with a semi-final 59.1 in between, will be on breaststroke and split 58.75 this morning, with Nyls Korstanje on fly.
He was 22.84 in the men’s 50 fly final to take 6th, and was 51.04 on the fly leg this morning. He will hope to be closer to the 50.27 he split last summer, and if he is they could shake things up.
Backstroke Breaststroke Butterfly Freestyle Cumulative Option 1 Maaike de Waard – 59.72 Caspar Corbeau – 58.53* Nyls Korstanje – 50.34** Marrit Steenbergen – 51.64 3:40.23 Option 2 Marrit Steenbergen – 58.96 Caspar Corbeau – 58.53* Nyls Korstanje – 50.34** Milou van Wijk – 52.68 3:40.51China
China has some interesting choices to make. The fact that Xu Jiayu is in 53-low rather than 52-low form makes their decision of how to split this relay much more difficult, and Qin Haiyang and Zhang Yufei on the middle two legs are the only swimmers who are locks.
With Yang Junxuan not in Singapore, putting Pan Zhanle on the anchor and Peng Xuwei on backstroke comes out slightly faster than Xu on backstroke and Wu Qingfeng on the freestyle based on results so far. XU does have a season-best of 52.49, but has been only as fast as 53.14 here.
Xu on backstroke does give them a higher ceiling, and Qin may be best served with clean water rather than fighting through the wash. With gold now a strong possibility with the U.S. failing to advance, there doesn’t seem to be much sense in going conservative.
That is betting big on Xu, who has been 53-point three times now in Singapore, but would allow Pan to avoid a double. Don’t be too shocked if they do go with Peng and Pan, but other than in 2024 when they missed the final China has never led off with a woman on backstroke.
Backstroke Breaststroke Butterfly Freestyle Cumulative Option 1 Xu Jiayu – 52.49** Qin Haiyang – 57.74* Zhang Yufei – 55.97* Wu Qingfeng – 52.94 3:39.15 Option 2 Peng Xuwei – 59.10 Qin Haiyang – 57.74* Zhang Yufei – 55.97* Pan Zhanle – 46.63 3:39.44Australia
McKeown will be on backstroke for definite, but this team is sorely missing a breaststroker. They got a 58.43 from Josh Yong en route to bronze last summer, but Nash Wilkes was 1:00.42 on day 1 and only just under the minute mark this morning.
His 59.76 split is probably enough to see him on the finals relay. Sienna Toohey and Ella Ramsay are both 1:06 swimmers, but this is still the leg where the gap between male and female is largest.
That leaves a likely Matt Temple–Meg Harris back half, with neither having any other swims today. They went Perkins-Taylor this morning, making the possibility of Perkins-Chalmers this evening a remote one, especially with Chalmers having the 100 free semis. That add-up is however slightly faster on paper, although Perkins was just 56.80 this morning, off her semi-finals time of 56.19
Harris was 51.87 on the women’s 4×100 free relay, and although we are yet to see Temple swim here he should be at least a 50-point split based on past performances.
Backstroke Breaststroke Butterfly Freestyle Cumulative Option 1 Kaylee McKeown – 57.16 Nash Wilkes – 59.76 Matt Temple – 50.50** Meg Harris – 51.87 3:39.29 Option 2 Kaylee McKeown – 57.16 Nash Wilkes – 59.76 Alexandria Perkins – 55.69* Kyle Chalmers – 46.53 3:39.12Canada
Only one leg of Canada’s prelims relay is a definite return tonight, with Josh Liendo nailing down the fly leg with a swim of 49.85. Elsewhere, Kylie Masse should slot in for Ingrid Wilm to give them about a second over the 59.34 Wilm swam this morning.
There is a decision to make on breaststroke, where Oliver Dawson had a good swim this morning to break 60 seconds and go 59.97, 0.76 seconds under his flat-start best. Finlay Knox was the breaststroker in Paris last year, and won’t have the 200 IM semis tonight. However, after he was just 1:01.02 in the individually on Day 1, Dawson has likely done enough to keep his spot.
Freestyle has the biggest decision. Brooklyn Douthwright was 54.31 this morning, and will be subbed off for either Mary-Sophie Harvey, Taylor Ruck or Summer McIntosh. Who the coaches pick will outline how serious they think their chances of a medal are. McIntosh does have the 200 fly semis just 25 minutes beforehand, but has the higher ceiling. If she’s on, they’re going for broke.
Backstroke Breaststroke Butterfly Freestyle Cumulative Option 1 Kylie Masse – 58.18** Oliver Dawson – 59.97 Josh Liendo – 49.85 Mary-Sophie Harvey – 53.84* 3:41.84 Option 2 Kylie Masse – 58.18** Oliver Dawson – 59.97 Josh Liendo – 49.85 Summer McIntosh – 53.40 (PB -0.5, no SB) 3:41.40Japan
Japan look like they went with their strongest team this morning. They have two potential substitutions, neither of which projects to move the needle too much.
The first of those would be to replace Taku Taniguchi on breaststroke with Yamato Fukusawa, who does have the faster season best. However, he was a second off that individually and did not make the semi-finals, whereas Taniguchi did and was 59.59 for 14th overall. The newly-minted 50 breast Japanese record holder should keep his place.
The second would be Rikako Ikee for Nagisa Ikemoto, but after she split 53.58 this morning replacing Ikemoto may not make the relay any faster. Expect them to stick rather than twist.
Backstroke Breaststroke Butterfly Freestyle Cumulative Option 1 Riku Matsuyama- 53.94 Taku Taniguchi – 59.09* Mizuki Hirai – 56.31* Nagisa Ikemoto – 53.58 3:42.92NAB
The emergence of Daria Klepikova seemed to have made this decision an easy one for NAB, but their prelims team raised at least one question.
Neither one of Kliment Kolesnikov and Miron Lifintsev were at their best in the 100 back individually, and they ended up 6th and 7th in the final. Lifintsev did not go under 52.5 through the three rounds, making Kolesnikov look the best choice for the finals relay, but the 19-year-old then threw down a leadoff of 52.08 this morning to match his best time.
The question then is whether or not he is left on. The coaches likely outlined that it would be Kolesnikov for finals regardless of Lifintsev’s performance this morning, with the difference between the two effectively a wash, but it is something to keep an eye on.
They should go Kolesnikov-Prigoda-Klepikova-Trofimova tonight, returning half the swimmers (Prigoda and Klepikova) from the team which broke the mixed medley relay record at short course worlds.
Chikunova on breast and Minakov on fly would be the only other real option, but Minakov didn’t look great in the 100 free heats this morning. That would allow Klepikova to slide to free, where she was 52.68 anchoring the women’s 4×100 free relay on Day 1.
Backstroke Breaststroke Butterfly Freestyle Cumulative Option 1 Kolesnikov – 52.26 Prigoda – 58.03* Klepikova – 55.92* Trofimova – 53.23* 3:39.44 Option 2 Lifintsev – 52.08 Chikunova – 1:05.47* Minakov – 50.32** Klepikova – 52.68 3:40.55
Poland
Poland will almost certainly run it back tonight. Adela Piskorska was 1:00.72 in the 100 back heats, whereas Ksawery Masiuk was 52.67 in the semi-finals for the men. With no female top-tier flyer, Jakub Majerski‘s spot on fly should be secure as well.
That means that they will go M-F-M-F, likely the only one in the final to do so and the only one of the eight finalists to do so in the heats. Dominika Sztandera will return on breaststroke, as will Kasia Wasick on freestyle.
Backstroke Breaststroke Butterfly Freestyle Cumulative Option 1 Ksawery Masiuk – 52.55** Dominika Sztandera – 1:05.92** Jakub Majerski – 50.99 Kasia Wasick – 53.62** 3:43.08Read the full story on SwimSwam: 2025 World Championships Day 4: Relay Speculation
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