The timing, of course, is certainly not ideal, not as far as the sport he plays for a living. Mickelson has been pointing toward the U.S. Open at Pinehurst since his surprise win at the Open Championship last year, the one that gave him three of the four major championships in his career.
"I would look at my career in a whole different light if I were able to get that fourth one," he said.
Mickelson didn't seem like a guy who was going to let this bother him going forward.
"I think that as a player, you have to be able to block out whatever is going on off the golf course and be able to focus on the golf course," Mickelson said. "And it's not going to change the way I carry myself. Honestly, I've done nothing wrong. I'm not going to walk around any other way."
If it was to distract him, Mickelson has experience. Nothing could have been worse than when his wife, Amy, was diagnosed with breast cancer in 2009. (His mother, Mary, was also diagnosed with breast cancer near the same time.) A month later, Mickelson had one of his six runner-up finishes at the U.S. Open. Later that year, he won the Tour Championship.
And if the investigation was going on early in 2013, it didn't stop Mickelson from winning the Scottish Open and the Open Championship in back-to-back weeks.
Mickelson was asked Saturday if he considered withdrawing from the Memorial, and he scoffed at the idea.
Then it was off to sign autographs, hand out golf balls left and right, engage with young and old.
Who knows what's really going through his mind, but it appears that if Mickelson is worried about anything, it is simply his golf game.