The Bucks fell to their third defeat at home in five nights with the loss, with reigning Finals MVP Giannis Antetokounmpo contributing 25 points for a side missing usual starters Khris Middleton, Jrue Holiday and Brook Lopez.
The Jazz shook off the after-shocks of their upset loss to the high-flying Chicago Bulls by opening up a lead with success from their first five three-point attempts and never surrendering it against the defending champions.
Mitchell looked to lead and had all the answers in the second half, with the 25-year-old responding every time the Bucks made a run.
Milwaukee had been down by 17 but got within five points halfway through the fourth quarter before Mitchell dropped five of his own as Utah went on a 9-1 run, with the Louisville-product also scoring the final two baskets to put the game beyond doubt.
The Jazz will host the Sacramento Kings on Tuesday, following their 105-99 loss to the Dallas Mavericks whose guard Luka Doncic halted a Kings late rally with an improbable three-point attempt from near centre-court that sealed the win.
The Bucks, meanwhile, will travel east with hopes of improving their fortunes against the Detroit Pistons, who were outgunned 117-91 by the Brooklyn Nets on Sunday.
Kevin Durant led the Nets with 23 points while James Harden picked up the slack in the third quarter for an 18-point triple-double.
James Borrego won his 100th game as head coach of the Charlotte Hornets, with the home side’s LaMelo Ball collecting 27 points and nine rebounds en route to a 125-113 victory over the Portland Trail Blazers.
Former Portland player Carmelo Anthony, meanwhile, continued his strong first season with the Los Angeles Lakers as he contributed 23 points in a reserve role in a 95-85 win against the Houston Rockets, who lost their fourth straight.
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