The Diamondbacks designated righty Kevin Mulvey for assignment to open a 40-man roster spot for southpaw Wade Miley, tweeted the team. Jason Marquis was placed on the 15-day disabled list to open an active roster spot.
Mulvey, 26, posted a 6.98 ERA, 5.0 K/9, 4.2 BB/9, and 0.9 HR/9 in 80 innings for Arizona's Triple-A affiliate this year. He was acquired from the Twins in August of '09 for Jon Rauch. Mulvey came to the Twins from the Mets in February of '08 as part of the Johan Santana trade.