From usbets.com:

During his introduction on the show, Trebek needled him with a question about his profession.

“James Holzhauer is from Las Vegas. He is a professional sports gambler. What does that mean, exactly?” Trebek said.

“Oh, I’ll bet on anything,” Holzhauer replied. “Why, are you looking for a little action on the [Stanley] Cup this year? I like the [Tampa Bay] Lightning.”

“Oh, really? No, I’m not looking for any action whatsoever,” Trebek said. “I go to Vegas for the shows, not the gambling.”