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05/02/2013 7:20 PM ET

Alvarez suffers setback in shoulder rehab

PHILADELPHIA -- Hopes of getting Henderson Alvarez back in Miami's rotation this month have been dashed.

Marlins manager Mike Redmond said on Thursday that the 23-year-old has been shut down due to right shoulder discomfort.

Alvarez, who started the season on the disabled list with right shoulder inflammation, has been building up for game action. Recently, he was facing batters, and the next step was going to be rehab-assignment games.

Now, there is no telling when Alvarez will begin throwing.

"He's going to be down," Redmond said. "He's taking a break."

Alvarez's setback comes at a time the Marlins welcomed shortstop Adeiny Hechavarria back from the 15-day disabled list.

Redmond added that catcher Jeff Mathis, who fractured his right collarbone early in Spring Training, began his rehab-assignment stint on Thursday. He was scheduled to play five innings for Class A Jupiter.

Alvarez, Hechavarria and Mathis were part of the blockbuster 12-player trade between the Marlins and Blue Jays in November.

Actually, both teams have dealt with injuries in the trade. Josh Johnson and Jose Reyes are on the DL for Toronto.

On the Marlins' end, Alvarez, Mathis and Hechavarria have spent time on the DL. So has Minor League outfielder Jake Marisnick (broken left hand). Marisnick currently is playing for Double-A Jacksonville.

Marlins nemesis Diaz joins Miami bench mix

PHILADELPHIA -- For years, the Marlins couldn't get Matt Diaz out. So they did the next best thing: They added the 35-year-old in hopes he can do damage to other teams.

Miami selected Diaz's contract from Triple-A New Orleans on Thursday, and he will provide a right-handed bat off the bench.

"We can use him against lefties," manager Mike Redmond said. "If you look at his track record and overall record, he's hit really well off lefties. He gives us some options in the outfield, and he's been playing the last couple of games at first base. We can use him at first base, too, or pinch-hit."

Diaz is a career .324 hitter against lefties, compared to .259 vs. right-handers.

A product of Florida State University, Diaz broke in with Tampa Bay in 2003, but he made his mark against Miami while playing for Atlanta.

He is a career .360 hitter against the Marlins, with 10 homers and 29 RBIs.

Even workers at the Marlins' old home, Sun Life Stadium, were aware of Diaz's impact.

"My wife tried to park in the old stadium, and they said, 'No, we're not letting you in.' They let her in, eventually; they were just messing with her," Diaz said Thursday. "It was one of those things where you thought you were going to jinx it by talking about it. But it never got jinxed, I don't know why."

Diaz joked about why he contacted the Marlins when he was looking to hook up with a team.

"It was one of the first calls you made, because you know they think you're good because you have good numbers against them," he said.

Diaz likely could see action in left field against left-handers as a right-handed-hitting counterpart to lefty-swinging Juan Pierre. Redmond even talked about Austin Kearns playing some left field, with Diaz at first base, a position he has never played in the big leagues.

One reason Diaz feels he has had success against lefties is because of his upbringing. Growing up, his brother, Zach, was a left-handed pitcher.

"He used to strike me out with changeups all the time in the backyard," Diaz said. "It really made me mad."

Zach, two years older, also attended Florida State.

"My first college at-bat came off of him in the 'Garnet and Gold Game,'" Diaz said. "It was a fall ballgame. He was one of the starting pitchers at the moment. I hit him off the top of the wall in right-center field, and from that moment I became a starter, and he went to the bullpen. I felt terrible. He's my hero in life."

Marlins get Hechavarria back from disabled list

PHILADELPHIA -- Shortstop once again is solidified for the Marlins.

Adeiny Hechavarria was reinstated from the 15-day disabled list on Thursday, the first day he was eligible to return. The 24-year-old had been out since April 17 with a bruised right elbow.

"It's good to have Hech back," manager Mike Redmond said. "We all felt lucky that it was only a couple of weeks on the DL, and we're getting him back. He's a big part of our defense."

Along with Hechavarria, the team also selected the contract of Matt Diaz from Triple-A New Orleans. The club designated infielder Nick Green for assignment and optioned lefty Brad Hand to New Orleans.

Hechavarria is a promising talent, who played in a couple of rehab-assignment games with Class A Jupiter before being activated.

"We'll get him back in there, back in the flow, and get him going," Redmond said.

The question is how much will he hit. At the time he was sidelined, Hechavarria was batting .184 (9-for-49) in 14 games.

"He's a guy who is a great defender," Redmond said. "You could just tell he was gaining more and more experience with every at-bat. We'll get him going again, and we hope this will be the last bump for him and he can grind it out for the rest of the season."

Joe Frisaro is a reporter for MLB.com. He writes a blog, called The Fish Pond. Follow him on Twitter @JoeFrisaro. This story was not subject to the approval of Major League Baseball or its clubs.