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8/31/2014 4:28 P.M. ET

Cosart among NL's best starters in August

ATLANTA -- You'd be hard pressed to find a starter in the National League better than Jarred Cosart in the month of August.

Cosart made the final arguments as to why he should be the NL Pitcher of the Month in Miami's 4-0 victory over the Braves on Saturday night at Turner Field.

The 24-year-old right-hander threw seven-plus shutout innings, improving his overall mark in August to 3-1 with a 1.64 ERA. His three wins were over strong playoff contenders -- the Cardinals, Angels and Braves. His last two wins were on the road.

What's separating Cosart since he was acquired by the Marlins from the Astros on July 31?

"He's got a good fastball, and makes the ball cut a little bit," manager Mike Redmond said. "He's got a nice curveball. He's been able to mix it up, and his changeup will continue to be a weapon against lefties."

Cosart credits Miami pitching coach Chuck Hernandez. When the right-hander was drafted by the Phillies in the 38th round in 2008, Hernandez was a pitching instructor in the organization. They spent a half-season together.

Since the trade, Cosart has tightened up his mechanics, specifically keeping his left shoulder closed.

According to Fangraphs.com, Cosart is throwing his four-seam fastball 39.6 percent of the time, and his cut-fastball 26.7 percent. His curveball is being used 26.1 percent and he's developing a changeup (3.9 percent).

Actually, Cosart doesn't classify himself as throwing a cutter.

"My four-seam grip is basically a cutter," he said.

So he basically has a hybrid four-seam/cutter pitch.

"All those pitches will continue to get better as he logs more and more innings," Redmond said.

They've certainly been effective in August.

Cosart will have competition in his quest to be NL Pitcher of the Month. Madison Bumgarner of the Giants is 3-1 with a 1.58 ERA. That's the only ERA lower than Cosart's among NL starters in August.

Kyle Hendricks of the Cubs is 4-0 (1.69) and Clayton Kershaw of the Dodgers is 3-1 (1.80).

Jennings, Capps due back Monday as rosters expand

ATLANTA -- Reinforcements are about to be on the way for the Marlins as rosters expand Monday.

Because the team is hopeful of making a serious playoff push, only a few additions are expected to be called up immediately.

"It's a different mindset than maybe when you're out of it, and you're trying to answer questions and things of that nature," president of baseball operations Michael Hill said. "The guys we bring, we think they can help us for what we feel is going to be an important month for us."

The team does plan on reinstating relievers Carter Capps (right elbow) and Dan Jennings (concussion) from the disabled list. Both are expected to be available Monday in the series opener with the Mets at Marlins Park.

Capps last pitched in a big league game May 25, and the hard-throwing right-hander threw two innings for Class A Jupiter in a rehab assignment game Saturday. Jennings tossed two innings at Jupiter on Friday. The lefty sustained a concussion after being struck on the head by a line drive at Pittsburgh on Aug. 7.

Infielder Enrique Hernandez and left-handed-hitting first baseman Justin Bour are candidates to be promoted from Triple-A New Orleans.

Catcher J.T. Realmuto at Double-A Jacksonville is also targeted to be promoted. When he is available will depend on if the Suns make the playoffs. If they do, Realmuto will remain in the Minors for the postseason.

The Marlins didn't make any major moves in the waiver trade period, because the club had added the pieces it felt were necessary July 31 when they acquired right-hander Jarred Cosart and Hernandez from the Astros.

"We felt like we accomplished what we wanted at the non-waiver Trade Deadline," Hill said. "Obviously, Cosart was a big acquisition for us, filling a huge need for us moving forward."

Reliever Bryan Morris, hampered by a right groin strain, is expected to be available in the next few days.

Morris is not on the disabled list, but he wasn't available for the series at Anaheim against the Angels and against the Braves at Atlanta.

Stanton on verge of first 100-RBI campaign

ATLANTA -- Four home runs separate Giancarlo Stanton from matching the Marlins' all-time home run record of 154 held by Dan Uggla.

Stanton also is closing in on a milestone no Miami player has achieved since Uggla in 2010.

After driving in a run in the Marlins' 4-0 win over the Braves on Saturday night, Stanton boosted his RBI total to 98. No Miami player has knocked in 100 runs since Uggla had 105 in '10, his final year with the franchise.

"It's a nice number," president of baseball operations Michael Hill said. "It will be the first time in his career that he's had it. I think that just speaks to what we said were our offseason goals coming into this year. That was to have a healthy Giancarlo. Obviously, he changes our lineup immensely when he is healthy and playing every day."

No Marlin has won the National League home run or RBI crown. Stanton, with 33 homers, has a chance to do both. He paces in both categories.

Adrian Gonzalez of the Dodgers and Atlanta's Justin Upton were second in RBIs with 91 entering Sunday.

The elusive century mark in RBIs hasn't come easily in the history of the Marlins.

It's been reached 15 total times, with Stanton on the brink of raising it 16.

Preston Wilson holds the franchise RBI record with 121 set in 2000.

Miguel Cabrera knocked in more than 100 runs a franchise-most four times -- '04 (112), '05 (116), '06 (114) and '07 (119). The only other player to do it more than once was Mike Lowell in '03 (105) and '01 (100).

Twice, two Marlins had 100 RBIs in the same season -- Cabrera and Carlos Delgado (115) in '05, and Hanley Ramirez (106) and Jorge Cantu (100) in '09.

Reliever Roe dealt to Yankees

ATLANTA -- Chaz Roe, who struck out 72 in 64 innings at Triple-A New Orleans, was dealt from the Marlins to the Yankees on Sunday afternoon for cash considerations.

Roe, 27, added 14 saves in 18 opportunities.

A non-roster invitee to Spring Training, Roe didn't pitch in the big leagues this season. The right-hander appeared in 21 games with the D-backs in 2013, posting a 4.03 ERA in 22 1/3 innings.

The Zephyrs' season wrapped up Sunday, and Roe could qualify to appear on the Yankees' postseason roster.

Roe went 3-3 at New Orleans and posted a WHIP of 1.16.

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.