Eugenie Bouchard correctly predicted Carlos Alcaraz’s US Open win 

There's an old saying that goes, "Victory favors ... only the prepared."

After the US Open men's singles final, Eugenie Bouchard is saying it too.

The former Wimbledon finalist correctly predicted that Carlos Alcaraz would defeat rival Jannik Sinner for the trophy based on how the two players warmed up for the match, she said on social media.

"I'll reveal my theory only if he wins," Bouchard wrote before Alcaraz pulled away from Sinner in a speedy four-set clash that not only earned him a sixth Grand Slam singles title, but also put him back on top of the ATP rankings.

Read more: Carlos Alcaraz captures sixth Slam and second US Open title, dethrones No. 1 Jannik Sinner

Bouchard's half-facetious theory, as it turned out, stemmed from candid scenes in the Arthur Ashe Stadium warm-up area prior to the players' arrival on court.

As Sinner stayed loose by playing games with a soccer ball and his coaches, the Spaniard took a more serious approach: He appeared focused and locked in with himself as he did a one-armed plank, and stretched while wearing noise-canceling headphones.

But for Alcaraz, preparedness didn't just come in the warm-up.

In his post-match press conference, he told reporters that he "studied" the four-set loss he took to Sinner in the Wimbledon final with his coaches.

"We saw the Wimbledon final, and we spoke about what we would have done better in that match just in case I'm going to face him in another time," he said.

Read more: Carlos Alcaraz: I studied Wimbledon final to beat Jannik Sinner in US Open rematch

"I think I played perfect. I played perfectly," Alcaraz continued, echoing coach Juan Carlos Ferrero's assessment. "I mean, I got to say that. If I want to win, you know, the US Open, if I want to beat Jannik, I have to play perfect, and I think he was right."