Daniil Medvedev’s strange way to celebrate his victory against world No. 1 Novak Djokovic of Serbia after winning the US Open title has to do with his great off-court passion—the soccer PlayStation game FIFA.

The moment World No. 2 Russian fell on the floor and celebrated his maiden Grand Slam title. Explaining his bizarre “dead fish” post-match celebration, Medvedev said on-court that, “Only legends will understand. What I did after the match was L2 + left.”