MILWAUKEE -- Cardinals manager Mike Matheny said it was a difficult decision to send reliever Mitchell Boggs to Triple-A Memphis after the right-hander struggled to begin the season.
Boggs was optioned to Memphis on Friday after going 0-2 with a 12.66 ERA in 14 games this year. In 2012, Boggs had a 2.21 ERA in 78 relief appearances.
"It's very hard to do for a guy that you know a year ago was one of the most dominant relievers in all of the game," Matheny said. "You want to give as much patience and time as possible. We've done that. We just needed to take a different route."
Boggs will work on his mechanics under far less stressful situations in Memphis, general manager John Mozeliak said.
"Clearly things have been frustrating for everybody involved at this point," Mozeliak said. "We just felt we had to do something. As I've said before, if you keep trying to run the same thing out there over and over again and expect a different outcome, that's how you define insanity."
"We felt Mitchell needed a break," Mozeliak said. "He can go down to Memphis and work on some things."
The contract of right-hander Carlos Martinez was purchased from Double-A Springfield to take Boggs' spot on the roster.
Cardinals promote pitching prospect Martinez
MILWAUKEE -- Carlos Martinez, the No. 3 prospect in the Cardinals system, said he was surprised to be joining the big league team and cried when he was given the news.
"He's excited about the opportunity, and can learn about what it's like to be up here and hopefully go out and make his pitches," catcher Tony Cruz said in translating comments in Spanish from Martinez during an interview session before the team played the Brewers.
Martinez had trouble securing a visa to enter the United States from the Dominican Republic, and he missed all of Spring Training. He did pitch in the Dominican during March, and he was 1-0 with a 2.31 ERA in three starts at Double-A Springfield.
"He's an electric arm," Cardinals general manager John Mozeliak said. "We feel like we need that inserted right now into our bullpen."
The Cardinals bullpen had a 5.90 ERA entering Friday's game, last in the Major Leagues. Mozeliak compared the arrival of Martinez to that of Trevor Rosenthal last year.
"The difference is Martinez didn't get a Spring Training to open up the eyes of the staff, but I can assure you that some of us who focus more on our Minor Leagues than others know what he is capable of doing," he said.
Mozeliak and manager Mike Matheny said Martinez would benefit greatly from catcher Yadier Molina's experience.
"He's been throwing the ball extremely well," Matheny said. "He comes into a unique situation. With Yadi behind the plate, he can just go out and pitch and not have to be the guy doing all the analytics. But right now, it's his time. I think he's ready for it."
• The Christian rock band "Third Day" was the guest of Cal Eldred, the Cardinals special assistant to the general manager, in the locker room before the game. The band had a concert scheduled Friday night in Brookfield, Wis.
• Springfield's game at Northwest Arkansas was rained out Friday night, delaying the start of Matt Adams' rehab assignment. Adams has been on the disabled list since April 22 with a right oblique strain.
Joe DiGiovanni is a contributor to MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.