Across three levels in 2019, Mears threw 46.2 innings, striking out 69 while walking just 18, maintaining a 3.28 ERA while being used exclusively out of the bullpen.

Recalled to the Pirates for the first time on May 26, he didn't make an appearance until his fourth stint with the major league team, which began on July 20.

[3][4] Mears was placed on the 60-day injured list to begin the year on March 15, 2022, after undergoing arthroscopic surgery on his right elbow.

[7] Four days later, Mears was designated for assignment to make room for free-agent signing Nathan Eovaldi.

On July 27, 2024, Mears was traded to the Milwaukee Brewers in exchange for Bradley Blalock and Yujanyer Herrera.