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 | Day 5 | Day 6 | Day 7 Finals: Day 1 | Day 2 | Day 3 | Day 4 | Day 5 | Day 6In a cut-throat prelims that saw 2nd through 12th separated by just over a second, we saw the last two world champions end up on the outside looking in. Australia, winners in 2023, placed 11th, while 2024 winners China were just ahead in 10th. Both were only two-tenths away from progressing.
That leaves the USA as big favorites for tonight as they separated themselves from the pack, swimming a time of 3:21.48 that is the fastest prelims swim ever in the event, with Canada the only non-European nation behind them. There are some lineup decisions that will have to be made, with the medals very much up for grabs now.
USA- 3:21.48
Jack Alexy and Patrick Sammon onto this relay should be the only changes tonight, although Torri Huske may come in for Simone Manuel as well. Chris Guiliano and Jonny Kulow were both 47.6 this morning, but Alexy is on fire here in Singapore and will only have the 50 free tonight, giving him one of the easier doubles, and Patrick Sammon split 47.03 on the men’s 4×100 free on Day 1.
Kate Douglass has no more individual swims here in Singapore, and after a 51.90 split on the women’s 4×100 free relay should retain her place on the anchor. Gretchen Walsh has both the 50 fly and 50 free in the finals session so is unlikely to be on, but Torri Huske will only have the 50 free. The final place will be between her and Manuel, who split 52.67 this morning.
Alexy – Sammon – Huske – Douglass may just shade it, but running back the same second half is also a strong possibility.
France – 3:24.21
There are at least two changes France can and probably will make tonight, as they could be well placed to make the podium. Maxime Grousset and Beryl Gastaldello, both of whom finaled in the individual 100, should slot in for Rafael Fente-Damers and Albane Cachot, with Yann le Goff and Marie Wattel keeping their spots after splits of 47.55 and 52.98 on their respective 4×100 free relays on Day 1.
The final potential change is the one we really want to see. We have not seen what Leon Marchand can do on a 100 free relay in long course, and after splitting 1:44.34 on the 4×200 last night with a stunning 49.59 front half, could well make this team even faster. He has the 400 IM and 4×100 medley relay tomorrow so may rest up instead, but there is a medal to be had here.
Grousset – le Goff – Gastaldello – Wattel is likely, but watch out for that second leg.
Netherlands – 3:24.31
Marrit Steenbergen threw down yet another 51-point split this morning to put the Netherlands into lane 3 tonight, and will retain her spot on the anchor leg. Tessa Giele will swap out for Milou van Wijk, who set a new best of 52.91 in the individual event last night to miss the podium by just 0.02 seconds, to give the Dutch one of the best back halves in the field along with the U.S..
Both women will have the 50 free semi-finals tonight, but with around 50 minutes between the two should be able to back that up relatively comfortably. The men on the first two legs may stay the same, although Nyls Korstanje could be a wildcard choice. He has a best of 48.86 from 2021 but has focused on fly since, but after missing the 100 fly semi-finals yesterday will have no other swims this evening. Niewold, who did not swim the 100 freestyle, potentially due to illness, could slot onto the leadoff after splitting 48.56 this morning, with Renzo Tjon-A-Joe the man to potentially give way after leading off in 49.12.
NAB – 3:24.46
NAB can bring in three swimmers to elevate this relay to the podium tonight, with Egor Kornev (47.29), Daria Klepikova (52.98) and Daria Trofimova (53.73) all setting best times here in Singapore. That probably makes them the favorite for silver, with Ivan Girev staying in after splitting 47.77 this morning, although Andrei Minakov could be an option despite having the 100 fly final.
Expect everyone other than Girev to be on the chopping block, with NAB looking dangerous if they can get everyone firing.
Spain – 3:24.48
Spain were the big surprise this morning. They hacked three seconds off their National Record to take 5th in the heats, with men’s 100 free National Record holder Luca Hoek le Guenedal splitting a big 47.60.
This team probably stays the same tonight after they went with a full-strength lineup in the heats. Sergio de Celis Montalben broke the Spanish record in 48.24 leading off the mens’ 4×100 free relay on Day 1 so has a little time to drop, and Carmen Weiler Sastre had a strong 53.73 anchor. None of their swimmers have any other swims tonight, so they will be fresh.
Italy – 3:24.84
The Italians will likely make wholesale changes, with Emma Menicucci the only swimmer who really guaranteed their finals spot after she split a wicked 53.38 on the anchor this morning. She will be joined by Sara Curtis for the women, who was 53.41 in the individual 100 free final but owns a best of 53.01 and anchored in 52.88 on the mixed medley relay.
The decision for the men could be more interesting. Carlos D’Ambrosio is very likely to come in after leading off the men’s 4×100 heats and finals in 47.96 and 47.78, but Thomas Ceccon will have the 100 fly tonight where he is in the medal hunt, and could forgo this one. If he does the decision is a bit of a wash, with Frigo splitting 47.34 on the men’s 4×100 to Zazzeri’s 47.36, but they should get a much faster front end than this morning where they were 48.46 (2nd leg) and 48.47 (leadoff).
Their fastest quartet is D’Ambrosio – Ceccon – Menicucci – Curtis, but the second leg will have questions purely based on availability.
Germany – 3:24.87
Germany will keep their back half together, but will almost certainly bring in Kaii Winkler for Rafael Miroslaw on the second leg for the men. Joshua Salchow will lead off again, and was 47.88 in the individual semi-finals, with Winkler a potential 47-mid split after going 47.52 on the men’s 4×100 free relay. Nina Holt was 53.62 on the third leg to dip under her flat start best of 53.81, with Nina Jazy also slightly under her PB of 54.71 with a 54.45 anchor
Canada – 3:24.94
Canada snuck in by just two-hundredths of a second over Hungary, and have two big changes they could make tonight. Those are Josh Liendo and Summer McIntosh, who would probably come in for Antoine Sauve and Brooklyn Douthwright and could probably take this team down into the 3:22s.
Liendo split 47.08 on Day 1, while McIntosh was not on the Canadian 4×100 free relay that placed 9th in the heats. Taylor Ruck will also come in after splitting 52.94 to anchor Canada to bronze in the mixed medley relay, with Mary-Sophie Harvey also likely to be swapped out.
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