Donovan Mitchell Says He's Over 'Rookie of the Year' Loss

Donovan Mitchell tells TMZ Sports he "ain't worried" about losing Rookie of the Year to Ben Simmons -- and the reason he doesn't care? The fans love him anyway!!!

The Utah Jazz star got a hero's welcome before an appearance at the Adidas store in Santa Monica on Tuesday -- the dude is like a frickin' rock star!!!

On the way in, we talked to Mitchell about the heated rivalry with Simmons for ROTY -- and he told us, "The media chose who they wanted to chose. And it's whatever."

He added, "I'm excited to be here. I've got all this support right here!"