Great Britain's Adam Peaty missed out on a second World Championship breaststroke medal as he placed fourth in the men's 50m final in Qatar.
The 29-year-old came into his second final of the Championships having clinched the bronze in the 100m event, but he only qualified for the 50m final in fourth place and could not sneak into the podium spots on Wednesday.
Peaty touched the wall with 26.77 on the clock, 0.28 seconds behind American bronze medallist Nic Fink, while Australia's Sam Williamson won gold in an Oceanic record time of 26.32.
Italy's Nicolo Martinenghi finished a mere seven hundredths of a second behind world champion Williamson, taking the silver in a time of 26.39, but Peaty's day would not end in total disappointment.
Following the 50m breaststroke final, Peaty formed part of Great Britain's bronze medal-winning troupe in the mixed 4x100m medley relay, where he, Medi Harris, Matthew Richards and Anna Hopkin combined for a total time of 3:45.09.
The USA's Fink, Hunter Armstrong, Claire Curzan and Kate Douglass stormed to medley relay glory in a time of 3:40.22, while Australia were nearly three seconds behind in the silver medal spot with 3:43.12.
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There was no further GB representation in Wednesday's finals, but national history was made for the Republic of Ireland's Daniel Wiffen, who won his country's first-ever World Championships medal as he took the men's 800m freestyle title.
The 22-year-old - who won 1500m silver at the 2022 Commonwealth Games while representing Northern Ireland - clocked 7:40.94, finishing just over two seconds clear of Australian silver medallist Elijah Winnington (7:42.95).
Italy's Gregorio Paltrinieri (7:42.98) clinched the bronze behind Wiffen, who told BBC Sport: "Obviously the goal coming into this meet was to win a world medal and be on the top podium for Ireland and obviously it's Ireland's first ever medal at a world championship level.
"It was just really trying to build the confidence in myself, make sure I can trust it and really execute my own race plan and that's what I did, so I'm very happy. I'm just ecstatic."
Elsewhere, Japan's Tomoru Honda - the bronze medallist in the 2022 and 2023 men's 200m butterfly - made it third time lucky with a time of 1:53.88 to win the title this time around, as Italy's Alberto Razzetti (1:54.65) and Austria's Martin Espernberger (1:55.16) took silver and bronze respectively.
Hong Kong's Siobhan Haughey was crowned world champion in the women's 200m freestyle, posting a time of 1:54.89, while New Zealand's Erika Fairweather (1:55.77) and Australia's Brianna Throssell (1:56.00) also finished on the podium.
