Leon Marchand capped off an "unbelievable" week in the pool as he claimed his fourth gold medal of the Paris Games.
Home hope Marchand has dominated at La Defense Arena, and won the 200-metre medley to complete a remarkable set of golds.
His win on Friday came on the back of success in the 400m medley, 200m butterfly and 200m breaststroke.
The 22-year-old, who was cheered on by French president Emmanuel Macron, told BBC Sport: "It has been unbelievable for me this week.
"I am enjoying every moment of it and this crowd was crazy. I was enjoying everything, it was so cool."
Marchand, who was just 0.06 seconds shy of the world record, finished ahead of Duncan Scott of Great Britain.
"He showed his class there, that is very quick," Scott told BBC Sport.
"What he just went after what has been a busy schedule for the guy – it was special to race him.
"It is a great way to finish it [his individual events] off."
There were two medals for France, with Florent Manaudou clinching bronze.