Mazur was traded from the Padres to the Marlins on Tuesday along with Robby Snelling, Graham Pauley and Jay Beshears in exchange for Tanner Scott and Bryan Hoeing, Jeff Passan of ESPN.com reports.
The Padres optioned Mazur to Triple-A El Paso on Saturday.
Mazur allowed one run on two hits and two walks while striking out one batter over 2.2 innings in a no-decision against Baltimore on Friday.
The Padres recalled Mazur from Triple-A El Paso to start Friday's game against the Orioles.
Mazur will be recalled from Triple-A El Paso to start Friday's game in Baltimore, Dennis Lin of The Athletic reports.
The Padres optioned Mazur to Triple-A El Paso on Wednesday.
Mazur (1-3) took the loss Tuesday against the Mariners, allowing five runs on seven hits and two walks while striking out six over 4.2 innings.
The Padres recalled Mazur from Triple-A El Paso on Monday.
The Padres optioned Mazur to Triple-A El Paso following Thursday's game against the Brewers.
Mazur did not factor into the decision in a win over the Brewers on Thursday, allowing three runs on five hits and three walks over 4.2 innings. He struck out three.