Matthew Wolff shot his second straight 8-under 64 to move into position for his second PGA Tour victory.

DETROIT— Matthew Wolff has been working on his mindset, trying to have a good time regardless of results to help him perform closer to his potential.

An ice cream truck outside the Detroit Golf Club seemed to help.

Wolff had a roller-coaster round that went well enough Saturday to give him a three-shot lead in the Rocket Mortgage Classic. He shot his second straight 8-under 64 to move into position for his second PGA Tour victory.

“I have to give credit to the ice cream truck that was circling the property,” said Wolff, who was 19-under 197 after three rounds. “I’m not joking, actually.”

Wolff made a 35-foot putt on the 138-yard No. 5 for birdie, his second of nine birdies.

“I heard the ice cream truck and I’m like, ‘I have a good feeling about this,’”