Australian swimmer James Magnussen has finished last in the 100m freestyle at the inaugural Enhanced Games.
Kristian Gklolomeev won in 46.6 seconds, just outside the world record of 46.4 set by China's Pan Zhanle at the Paris Olympics.
Magnussen was never in contention and clocked 49.44 on Monday (AEST) in Las Vegas, well outside his best time of 47.1 set in 2012.
The 35-year-old, the first athlete to sign for the Enhanced Games, was wearing a one-off gold swim suit.
Magnussen, who won $US50,000 ($A70,000) for his 100m result, will also swim the 50m freestyle.
The financial lure is substantial for the Australian, a two-time Olympian and dual 100m freestyle world champion who retired from swimming in 2018, until the arrival of Enhanced Games.
The concept of the Games is that athletes can take performance enhancing drugs, with track and field sprinting and weightlifting also on the program.
There is $US250,000 ($A358,000) prizemoney on offer for race winners; and a $US1 million ($A1.4 million) bonus for breaking the 100m freestyle world record.
That bonus is also on offer to anyone breaking the 100m sprint world record at the Games, a multi-sports event with no drug testing founded by an Australian.
The Melbourne-born entrepreneur, Aron D'Souza, has since left the company that became The Enhanced Group.
On May 8, the company officially launched on the New York Stock Exchange with a reported $1.2 billion enterprise valuation.
The performance enhancing drugs being taken by Magnussen and other athletes are being marketed and sold by The Enhanced Group.
