Indianapolis hosted the inaugural short-course event last week, with a first-season budget of $20million (£16million/€18million), funded by ISL founder, Ukrainian billionaire Konstantin Grigorishin.

A total of $7million (£5.5million/€6.3million) goes to athletes and teams in prize money.

Week one saw the Energy Standard team on top with 539 points, the Cali Condors second on 457, DC Trident third on 330.5 with Aqua Centurions fourth on 300.5. 

The action at Piscina Felice Scandalone got underway with the women's 100 metres fly, won by Kelsi Dahlia of the Cali Condors in a time of 55.91 seconds, ahead of Sarah Sjostrom of Energy Standard in 56.63. 

Anastasia Shkuradia was third in 57.37, also for Energy Standard. 

The men's 100m fly was a thrilling contest, with le Clos just hanging on for the win for Energy Standard in a time of 49.35.

Caeleb Dressel was millimetres behind for the Cali Condors, in 49.36.

Matteo Rivolta of the Aqua Centurions rounded out the top three in 50.61.  

The Cali Condors continued to dominate, with a one-two for Lilly King and Molly Hannis, respectively, in the women’s 50m breaststroke. 

However, the Aqua Centurions hit back in the men's 50m breaststroke, as Nicolo Martinenghi delivered victory in 25.98, with team mate Fabio Scozzoli second in 26.06. 

But order was restored in the women's 400m individual medley, thanks to Melanie Margalis of the Condors, who finished more than three seconds ahead of Fantine Lesaffre of Energy Standard. 

Other victories for the Condors came for Kyle Masse in the women's 200m backstroke, Dressel in the men's 50m freestyle and Olivia Smoliga in the women's 50m backstroke. 

However, they had to settle for second in the men's 4x100m freestyle, a full second behind Energy Standard. 

At the end of day one, the Cali Condors were on top with 237.5 points, ahead of Energy Standard on 230. 

These two were well clear of Aqua Centurions on 174 and DC Trident bringing up the rear with 162.5. 

The competition continues tomorrow with 11 more events.