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8/10/2014 1:05 P.M. ET

Jennings' injury a reminder of dangers on mound

CINCINNATI -- Watching a teammate get struck on the head by a comebacker is a stark reminder of the risks pitchers take every time they step on the mound.

The Marlins experienced a scare firsthand on Thursday night in Pittsburgh when reliever Dan Jennings suffered a concussion after Jordy Mercer's drive pegged him on the left side of his head.

Fortunately, Jennings appears to be fine. He does have a concussion, but avoided a more serious injury.

"As a pitcher, it's one of our worst nightmares," closer Steve Cishek said. "I don't even want to look at video, because you don't want it to be in your head. And having that being one of your teammates and friends, you know their families are also watching, and they're scared too. You feel for them, too. You've got all these emotions going when something like that happens."

What can be done to increase pitcher safety?

"I don't know if there is anything you can do, other than putting like a mask or something on," reliever Mike Dunn said. "I can pretty much guarantee nobody is going to wear [one]."

Alex Torres of the Padres is the first and only pitcher to wear an MLB-approved protective cap, manufactured by isoBlox.

But the hat is bulky, and many pitchers don't find them comfortable. Another idea some pitchers are discussing is a hat with ear flaps to protect more of the head.

"I know they're trying with those big, bulky hats," Cishek said. "The problem is they're just not comfortable to wear, and they're heavier.

"You've got to wait for the technology to get out there, and hopefully some day it will, where we can get out there and not wear a hat that is big and bulky, and is little lighter and comfortable. At least they're moving in the right direction and trying to figure something out."

In the meantime, pitchers are focused on one thing when they take the mound -- getting batters out.

"You know there is a risk every time you go out there and throw a pitch," Dunn said. "Ultimately, you've just got to put it behind you and not think about it."

Penny brings veteran savvy to young Miami staff

CINCINNATI -- Having talent is one thing, and the Marlins have a promising, young rotation with plenty of potential. But having an experienced veteran with All-Star and World Series experience also has its benefits.

The Marlins are hoping to reap some of them with the arrival of Brad Penny, who shook off the rust of a two-year big league absence on Saturday to claim his first MLB victory since 2011.

Penny, 36, is a two-time All-Star, and he was part of the Marlins' rotation on the 2003 World Series championship team.

Penny's return on Saturday night wasn't picture perfect. He labored with command, walking four and getting into many deep counts over five innings. But he minimized damage, showed composure while pitching at his own tempo.

Manager Mike Redmond hopes some of his young starters were paying attention.

"For young guys, sometimes when it starts to snowball, it leads to the big inning," Redmond said. "We've seen that a few times this year. With veteran guys, they continue to make pitches, knowing they're only one pitch away from getting out of any situation. We saw Brad do that."

Penny gave up two runs (one earned) and picked up the win in Miami's 4-3 victory over the Reds.

In a career that started with the Marlins in 2000, Penny has logged 1,904 big league innings, which is more than the total of the team's other five starters combined. Currently, Henderson Alvarez is on the disabled list.

Alvarez (491 1/3 career innings), Nathan Eovaldi (411 1/3), Tom Koehler (137 1/3), Brad Hand (151 1/3) and Jarred Cosart (181 2/3) have combined for 1,531 1/3 innings.

"Hopefully, I can show them how you go about being a professional," Penny said. "There is a lot of talent on this team. I'm lucky to get another opportunity to pitch at this level."

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.