Dr. Dunkenstein 101: Former Utah Jazz star Darrell Griffith offers dunk contest advice to Donovan Mitchell

SALT LAKE CITY — Inside the Zions Bank Basketball Center Tuesday, a private session was held between Utah Jazz rookie Donovan Mitchell and dunk coach Chuck Millan.Mitchell has just a few more days before he’s ready to display their secret routine during the Slam Dunk contest at 6 p.m. (MT) Saturday at NBA All-Star Weekend.There’s still some work to do, though.“I haven’t perfected it yet,” Mitchell said, smiling. “I got some practice yesterday and it was