The former world No. 4 is feeling so healthy right now that he's also entered the Indian Wells doubles draw with Grigor Dimitrov.
"We love to play together. He's a great guy," Del Potro said about Dimitrov. "We have a good relationship, and also it's good practice for us before a singles match."
Of course, there's also the new $1 million bonus for any player who wins both the singles and doubles draws, but, at least according to Del Potro, that's not why he's playing both.
"You never know what could happen, but we are playing just for our tennis," he said. "That's the only reason."
Del Potro landed in the same quarter of the singles bracket as Novak Djokovic and Marin Cilic. He and Dimitrov will play Marc and Feliciano Lopez in the first round of doubles.