Cardinals activated C Brayan Peña from the 15-day disabled list.
Pena has been out all season after undergoing surgery in early April to remove loose cartilage from his left knee, but he's finally ready to serve as Yadier Molina's backup. Eric Fryer was designated for assignment to clear a spot on the active roster.
Mets released INF Danny Muno.
Muno, who appeared in 17 games with the Mets last season, was batting .239/.391/.318 in 110 plate appearances in Triple-A this season. The 27-year-old will attempt to latch on elsewhere.
Red Sox recalled RHP Pat Light from Triple-A Pawtucket.
He'll take Eduardo Rodriguez's place on the active roster. Light made one appearance for the Red Sox in April and owns a 2.05 ERA and 32/13 K/BB ratio over 26 1/3 innings in Triple-A this season.
Chad Kuhl is lined up to start Saturday against the Athletics.
The Pirates have an off-day on Thursday, so there was some question about how the rotation would shake out, but they'll continue to use the same order for now. Kuhl beat Clayton Kershaw in his major league debut Sunday after allowing three runs over five innings.
Tommy La Stella (hamstring) went 2-for-3 with a two-run homer and a single Monday in his first minor league rehab game with Triple-A Iowa.
La Stella has been sidelined since June 7 with a right hamstring strain, but he could be ready to rejoin the Cubs within days. The 27-year-old has been a productive bench player this season, batting .291/.378/.494 over 38 games.