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5/16/2013 6:50 P.M. ET

Marlins raise the roof, but wins don't follow

MIAMI -- When a retractable-roof stadium was built in the neighborhood of Little Havana, teams and fans alike relished the idea of avoiding rain delays and humid weather seasonal to South Florida summers.

So far in 2013, a strange split has occurred: Entering Thursday, the Marlins had lost all 10 games, including the first two in the Reds series, when both the roof and outfield windows have been open.

With either just the roof or the windows open, Miami holds a 5-3 record. The roof was open just eight times all of last season.

"I'm not worried about that," Marlins manager Mike Redmond said. "Believe me -- at this point -- the least of my worries is whether the roof's open or closed."

Redmond said the ball definitely carries more when the roof is open. There's also a wind tunnel. Over the first two games of the series, weather was in the mid-high 70s, with 12-to-14 mph winds.

"The temperature's nice right now," Redmond said. "It's not too hot, it's very comfortable. I like it when the roof's open. It's a good atmosphere. I know the guys like to be comfortable and the fans do too."

Hill working overtime on nuances of first base

MIAMI -- Every day since Spring Training, Marlins infield coach Perry Hill goes through the fundamentals of playing first base.

Hill teaches everything from positioning to how to hold a runner on. Whether it's responsibilities on relays or how to catch a throw, it's a "whole different ballgame" for many of the guys.

"There's a lot more to it than running over there and putting your foot on the white thing," Hill said. "There's a lot of details to learn to make the job easier we've been trying to cover."

Thanks to a multitude of injuries, the Marlins have been through six first basemen already.

Casey Kotchman and Joe Mahoney -- both signed to fill in for Logan Morrison while he recovered from knee surgery -- have been on the disabled list for most of the season.

Marlins manager Mike Redmond would like to get Greg Dobbs, who has started 30 games at first, some days off, especially with left-handers on the mound.

Hill's pupils of late -- all with limited experience at the position -- have been Nick Green, Matt Diaz and Chris Coghlan. With the team currently carrying three catchers, Miguel Olivo is also an option.

"We've had so many injuries at first, we've got to give [Redmond] some options," Hill said.

Ruggiano, Polanco gets breather in finale

MIAMI -- A day after utilizing the same lineup in consecutive games for the first time all season, Marlins manager Mike Redmond gave a couple of guys Thursday night's series finale off to refuel.

Chris Coghlan started in center field in place of Justin Ruggiano, who was 0-for-7 on the homestand. Coghlan is tied with Eric Hinske for second in the National League in pinch-hits (six), including one on Wednesday night.

"[Ruggiano's] been in a little bit of a rough patch," Redmond said. "Get [Coghlan] in there. He's had some good at-bats off the bench and see if he can give us a little spark and go from there."

Nick Green earned the nod at third for Placido Polanco, who is 1-for-7 in the series. Polanco entered Thursday having started a team-high 36 of 40 games.

Redmond said he wants to keep his players fresh so they last the entire year.

"He just looked a little tired yesterday," Redmond said of Polanco. "I know we just came off a day off [Monday], but because of the situation with lack of depth, I've had to run him out there probably more than I anticipated."

Worth noting

• According to Redmond, right-hander Nathan Eovaldi threw between 30 to 40 pitches in a bullpen session on Thursday, and "everything was good." Eovaldi will probably toss another one or two bullpen sessions before progressing further.

• Catcher Jeff Mathis, reinstated from the disabled list with a broken collarbone he sustained during the first game of Spring Training, made his first start in Thursday's series finale.

• First basemen Kotchman and Mahoney took grounders and played catch before batting practice. Kotchman also hit and is close to going out on a rehab assignment.

• The Office of the Commissioner of Baseball announced that right-handed pitcher Juan Arias received a 50-game suspension without pay after testing positive for metabolites of Stanozolol, a performance-enhancing substance in violation of the Minor League Drug Prevention and Treatment Program. Arias, who is currently on the Marlins' Dominican Summer League roster, will begin his suspension at the start of the DSL season.

Christina De Nicola is a contributor to MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.