© 2014 MLB Advanced Media, L.P. All rights reserved.

7/25/2014 7:53 P.M. ET

Realmuto up, Disco down as Marlins balance roster

HOUSTON -- After carrying an extra pitcher for the four-game series in Atlanta, the Marlins on Friday reverted their roster back to carrying 13 position players.

Before opening an Interleague series in Houston, Miami recalled catcher J.T. Realmuto from Double-A Jacksonville and optioned right-hander Anthony DeSclafani to Triple-A New Orleans.

The Marlins are back to carrying 12 pitchers, where they are more ideally suited.

The reason to go with an extra arm in Atlanta was because of back-to-back short stints from their starters last weekend against the Giants at Marlins Park. The San Francisco series depleted the bullpen, so to play it safe, a 13th pitcher was brought to Atlanta.

Miami ended up taking three of four from the Braves, and the starting pitching was solid.

Realmuto, making his second stint with the Marlins, is batting .301 with six homers and 46 RBIs for Jacksonville.

"He's coming in to give us some depth," manager Mike Redmond said. "We called up DeSclafani, because at the time, we needed some depth with our pitching."

In the series opener on Friday at Minute Maid Park, Jarrod Saltalamacchia was used as the designated hitter, with Jeff Mathis catching lefty Brad Hand.

"Here with the DH, it allows us with some flexibility to bring in another catcher," Redmond said.

Marlins' trade market could hinge on Hand, Turner

HOUSTON -- For weeks, the Marlins have made it clear that they're surveying the trade market for a starting pitcher. Ideally, it would be a pitcher who has controllable years in terms of service time.

If a rental made sense, Miami would be open to make a deal, but at the right price.

As talks continue, the Marlins also are giving starters currently in the rotation a chance to secure spots. Brad Hand, who started on Friday, and Jacob Turner, specifically, are getting second chances after struggling in the rotation early in the year.

Both have shown promise. If they continue to impress, it could change the organization's thinking in terms of making a possible deal by Thursday's non-waiver Trade Deadline.

"It's time for them to take the next step," general manager Dan Jennings said. "At this point, they're showing signs of doing that. We need them. They need to take the step. They've done it thus far out of the gate. That's huge."

Turner will start on Sunday in the series finale in Houston.

Turner and Hand each have thrown out of the bullpen, too. Now, they're getting their chances to start every fifth day.

An internal option to join the rotation is Brad Penny, who is currently at Triple-A New Orleans, where he's shown promise as he attempts his comeback. Penny last pitched in the big leagues in 2012.

Marlins encouraged as Kolek's back improves

HOUSTON -- The Marlins are optimistic that Tyler Kolek's lower-back issue isn't serious.

The No. 2 overall pick in the June First-Year Player Draft, Kolek is dealing with a lower back sprain, and he is on a no-throw status for about a week.

"There is much improvement," Marlins general manager Dan Jennings said Friday. "He completed light core exercises and rode the bike with no issues."

In a week, an X-ray will be taken and Kolek will be further evaluated.

Kolek felt a sharp pain in his lower back on the right side while pitching for the Gulf Coast League Marlins on Wednesday in Jupiter, Fla. The 18-year-old faced four batters that night, and he was lifted in a game that was suspended due to weather.

"It was one of those, when it hit him, the kid felt like he was stabbed," Jennings said. "So they just took him out."

A native of Shepherd, Texas, Kolek is a hard-throwing right-hander whose fastball reached as high as 102 mph in high school.

"He's feeling much better," Jennings said.

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.