Last year, he won in a much slower time of 1.48:20, proof that his progress over the distance has been meteoric.
In three days of competition in Minneapolis, the 20-year-old Toulousain made a raid, which translates into three titles and as many new records to his credit.
Thursday, the one who won his first two world champion titles in the 400m medley and 200m medley last year, won the 200 yard medley, in 1.36:34, again succeeding again reference time.
In 2022, he had won the title with a time of 1.37:69, which was already a record.
Marchand, who is coached by Bob Bowman while studying computer science at Arizona State University, did even better on Friday by being the first swimmer to go under 3:30 (3.28:82) on the 400 yard medley, de facto winning the title.
And he then completed the fastest breaststroke stint in history (49.23), in the 4x100 yard medley.
Enough to send a message to the competition, four months before the World Swimming Championships to be held in Fukuoka (Japan).