The Suns' only lead was 2-0.
Utah scored 14 straight points to go up 24-8 before Bender came off the bench for eight first-quarter points and Phoenix finished the first quarter with a 12-2 run to cut the lead to 28-23.
The Suns never got any closer. Mitchell sank a 3-pointer, was fouled by Booker, and made the free throw for a four-point play, igniting a 12-0 run that put Utah up 53-33 on Rubio's 3.
The Jazz led 62-40 at the half. They were up by 36 during the third quarter and 41 in the fourth.
It was the most one-sided loss for Phoenix since Jay Triano took over as interim coach three games into the season. He lamented the inconsistency of his team, which was coming off a home win over Dallas.
"It's probably the sign of a young basketball team, but it's disappointing to me," Triano said. "I'd like to think we make steps and we start moving in the right direction and then we take a step back."
MIGHTY MITCHELL
Mitchell is the seventh active player to score 40 as a rookie, and now he's done it twice. He scored 41 in a win over the New Orleans Pelicans on Dec. 1. The other six are LeBron James, Carmelo Anthony, Kevin Durant, Eric Gordon, Steph Curry and Blake Griffin.
Mitchell said this was better than his 41-point game because the team played better.
"My biggest thing is I was just relaxed and settled down," he said. "When I come into games relaxed and kind of calm, that's when I start to figure out things."
TIP-IN
Jazz: Mitchell will participate in the Rising Stars Challenge and the Skills Challenge on All-Star weekend. ... Rubio has five career triple-doubles, none with Utah. ... Utah's largest margin of victory this season was 47 points against Washington on Dec. 4.
Suns: Booker was 2 for 2 at the foul line to break the franchise record for consecutive free throws made in a season at 58. Kevin Johnson (1989-90) and Mike Bratz (1980) shared the previous record of 57. ... T.J. Warren matched his season low with four points. ... Suns signed guard Josh Gray to a 10-day contract. Gray had been with the Northern Arizona Suns of the G-League. He scored seven points, all in the fourth quarter, in his NBA debut. ... Center Alex Len (right ankle soreness) did not play for the second straight game and has missed five of the last six.
UP NEXT
Jazz: at San Antonio Spurs Saturday night.
Suns: Host Charlotte Hornets on Sunday.
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More AP basketball: https://apnews.com/tag/NBAbasketball
By Bob Baum, The Associated Press