Mujica, 28, has appeared in 41 games (39.0 IP) for the Marlins this season, limiting opposing right-handed batters to a .211 batting average (16-for-76). The 6-foot-2, 215-pound native of Venezuela has earned 12 holds and two saves this season along with a 4.38 ERA.
Mujica is in his seventh Major League season, having compiled a 17-18 career mark and 4.13 ERA in 287 games with Cleveland (2006-08), San Diego (2009-10) and Florida/Miami (2011-12).
The Cardinals will control Mujica's rights through the 2013 season, when he can become a free agent. He makes $1.625 million in 2012 and will remain eligible for arbitration next year.
Cox, 23, was the Cardinals first-round pick in the 2010 draft, taken 25th overall. At the time of the trade, he was on the Triple-A disabled list with a hamstring strain. This season, the left-handed hitter had a line of .254/.294/.421/.716 in 316 plate appearances over 84 games. He had nine home runs and 30 RBI.
Mujica is expected to join the Cardinals for their series in Colorado this week, at which time the team will announce a corresponding move to the 25-man roster. Cox was on the 40-man roster, so Mujica takes his spot there.
Brian Walton can be reached via email at firstname.lastname@example.org. Also catch his Cardinals commentary daily at The Cardinal Nation blog. Follow Brian on Twitter.
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