Lil Wayne knows his sports well enough to understand free agency: When you're not signed, you go with the best offer.

The Cash Money rapper was formerly a blogger for ESPN, opining about the NCAA Men's Basketball Tournament, among other topics. Now, however, the incarcerated rap star has sent his latest athletic musings to ESPN the Magazine's rival, Sports Illustrated. (He's also been posting about sports on his personal blog.)

Weezy sent a handwritten note to the publication with his predictions for the U.S. Open's men's and women's tournaments. The rapper picked top-seeded Rafael Nadal in the men's bracket and Belgian star Kim Clijsters to take the woman's crown.

"I'm definitely rooting for [Nadal] to get the Grand Slam and win the U.S. Open," Lil Wayne wrote on SI stationary after the magazine sent him a letter. "He's already became the 2nd youngest player to win 8 major titles before the age of 25. He's halfway there to Roger [Federer]'s 16. And even while battling knee tendinitis, he's still ranked #1. His Wimbledon performance was one of a kind. He simply plays with pure passion and leaves it all out there on the court."

Lil Wayne is slated to be released from prison in November. He was sentenced to a year in prison in New York after a 2007 gun bust.

Next month, the Cash Money Records superstar will release an EP directly online. Since he began his jail time, the rapper has released a flurry of music videos, recently appearing in Drake's "Miss Me" clip.

Wayne's protégé Drake said his boss has already set a November 5 date for his welcome-home concert. "November 5, the Welcome Home Weezy concert," Drake told fans during a Ustream chat. "That's gonna be crazy. I told you I got you. I would never just Ustream and talk about nothing."

What do you think about Weezy's take on tennis? Let us know in the comments!