Ariarne Titmus stole the show again in the pool at Tokyo 2020, while Yui Ohashi also doubled up and Katie Ledecky got herself on the gold trail.
Australia's Titmus was back competing against Ledecky just two days on from their epic in the 400m free, though the latter was not in medal contention this time in the shorter 200.
However, the American – who has previously described herself as a "distance swimmer with a sprinter's mentality" – did become a six-time Olympic gold medallist on Wednesday.
Here's a round-up from the Tokyo Aquatics Centre.
TERRIFIC TITMUS DOUBLES UP
Wednesday's 200m freestyle race was billed as Titmus versus Ledecky II, with the former upstaging her American rival in the 400m free in a thriller two days earlier.
This time Ledecky was off the pace down in fifth and it was Hong Kong's Siobhan Haughey providing the test as Titmus had to pull one out of the bag again to get the gold.
A storming last 50m propelled her to a new Olympic record time of 1:53.50 and cemented her status as a breakout star.
"I could see I was trying to mow Siobhan down on the third 50. I had no idea where she was on the last lap. I knew I had Penny [Oleksiak, bronze] covered but Siobhan was the person that was there," Titmus said.
"I felt a little bit that was there. I felt a little bit - my legs started to go a bit but I'm happy to get it done."
Titmus joins Shane Gould and Ian Thorpe as the only Australians to complete a 200/400m freestyle double at a single Games.
Ariarne Titmus (AUS) 1:53.50— Australian Swim Team (@DolphinsAUS) July 28, 2021
Siobhan Bernadette Haughey (HKG) 1:53.92
Penny Oleksiak (CAN) 1:54.70
It's a golden double for Arnie!
She powered through in the final 50m win gold in an Olympic record time #TokyoTogether | #Tokyo2020 | #Swimming | @AUSOlympicTeam pic.twitter.com/6pVmielP2P
JOY OF SIX FOR LEDECKY
She may have been unable to retain two of her titles from 2016 but the awesome Ledecky added to her gold medal haul with a dominant win in the first ever women's 1500m free Olympics final.
The American came home in 15:37.34 to lead a US one-two from Erica Sullivan.
Ledecky has now won gold medals at three different Games, having also topped the 800m free podium at London 2012.
OHASHI MARVELS IN IM ONCE MORE
Another star of these Games has been Ohashi, who will have delighted the Japanese fans watching at home after adding to her 400 individual medley crown in the shorter 200m race.
A race tipped to be wide open proved to be so with Ohashi battling stroke-for-stroke down the final 50m with American Alex Walsh, who was pipped by just 0.13 seconds.
Walsh's compatriot Kate Douglass rounded off the podium in third.
MILAK MAULS RIVALS
You can never be fully certain of an outcome in any sport but Kristof Milak was about as close to a shoo-in in the men's 200m butterfly as you can get.
So it proved to be. The Hungarian at least had the good decency to allow his rivals to believe they had a chance before absolutely blasting them out the water with his trademark finishing power.
Milak came home in a time of 1:51.25, a new Olympic benchmark and only half a second off his own world-record time. Japan's Tomoru Honda took silver from lane eight, some 2.48 seconds adrift.
DOUBLE DELIGHT FOR DEAN AS TEAMGB STAR IN RELAY
There was to be no record for TeamGB in the men's 4x200 free but they utterly dominated the competition to bring home gold in a time of 6:58.58.
Tom Dean, champion over the distance in the individual race on Tuesday, anchored the first leg before James Guy hit the front on his stint.
Matt Richards further stretched the advantage and Duncan Scott – who took silver behind Dean – brought it home in style with the Russian Olympic Committee over three seconds behind to take silver.