The Arizona Diamondbacks announced today they have agreed to a minor league contract with left-handed pitcher Ron Mahay and assigned him to extended Spring Training, according to D-backs' Senior Vice President, Scouting & Player Development Jerry Dipoto. Mahay, 39, posted a 1-1 record and 3.44 ERA (13 ER in 34.0 IP) with 8 walks and 25 strikeouts in 41 relief appearances with the Minnesota Twins after his selection to the big league roster on April 15. He did not allow an earned run in his first 11 appearances with the Twins, allowing just 5 hits and fanning 10 in 9.1 innings.
I imagine this move is mostly for depth, to provide left-handed relief help in the event Joe Paterson doesn't prove up to the task of facing major-league hitters - as he has seen just four to date, there's not much data to go on. Mahay certainly falls into the "veteran" category, having made his debut in 1997 with the Boston Red Sox. He has also spent time with the Oakland Athletics, Florida Marlins, Chicago Cubs, Texas Rangers, Atlanta Braves, Kansas City Royals and the Twins, posting a career 27-12 record and 3.83 ERA (120 ERA+), with 266 walks and 470 strikeouts in in 568 innings.
His best year is probably 2004 with the Rangers, when he had a 2.55 ERA in 67 innings, resulting in a 1.8 WAR, but his ERA+ has been above 100 every season for the past five. Random factoid: he was one of the replacement players called up in 1995 due to the labor dispute, and as such is not a member of the MLBPA, so you won't be able to splash out on any Ron Mahay merchandise. He had signed a minor league contract with the Dodgers, and took part in spring training, but was unable to make the roster and was released by Los Angeles on March 26.