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7/21/2013 4:30 P.M. ET

Bullpen lefties making life easy for Dodgers

WASHINGTON -- The two left-handers in the Dodgers' bullpen have been consistent options throughout the season, shutting down left-handed hitters and more than holding their own against righties. That's about where the similarities end for J.P. Howell and Paco Rodriguez, two pitchers who took very different paths to the same role.

Rodriguez, a reliever throughout his three-year collegiate career at Florida, was the Dodgers' second-round pick in the 2012 First-Year Player Draft and made it to Los Angeles last September, the first in his class to reach the Majors. The 22-year-old has proven his big league readiness, with a 2.18 ERA over 58 career appearances. This year, his .132 opponents' batting average leads the Majors. According to Rodriguez, that previous experience as a reliever helped him "tremendously."

"I understood how to be a bullpen guy," said Rodriguez. "Sometimes it takes a starting pitcher a little time to get used to warming up without having to long toss and the whole gig. For me, it was just something I did during college, so it was easy for me."

Howell knows the other side of things. He started throughout the Minors, but posted a 6.34 ERA over 33 outings from 2005-07 with the Royals and Rays. The 30-year-old now believes he wasn't mature enough and didn't have the work ethic to handle the time off between starts.

He finally flourished when Tampa Bay sent him to the bullpen in '08, though he also went through an adjustment period. Then-teammate Dan Wheeler was instrumental in helping Howell find a proper warmup routine and learn how to prepare mentally.

"It took me a while to learn that aspect of it, the everyday mentality, because as a starter it's much different," said Howell. "If you come into it like Paco did, he's coming in with experience. It took me two, three years to learn that -- and he had it. I think that's why you're seeing such a great season with him -- and even last year, in the short stint he had, he did well."

If Rodriguez has been the Dodgers' No. 1 lefty out of the bullpen, Howell has been No. 1A. He owns a 2.25 ERA over 40 appearances, holding opponents to a .201 average -- including .159 against lefties.

A lot of that success can be attributed to health. After two strong seasons with the Rays, Howell missed 2010 to have surgery on his left shoulder, then posted a 6.16 ERA in '11. He bounced back last year, then signed with Los Angeles. He is finally feeling like his old self, forming a highly effective duo with Rodriguez.

The rookie has impressed Howell, both with his stuff and with his approach.

"Everything looks like a fastball, and he throws a lot of fastballs. So when you see that and your brain tells you to swing at that pitch, you kind of have to," Howell said. "He's a funky guy, but at the same time, mentally he's one of the toughest guys out there. … He's prepared every single day, he's ready to take the ball every moment. He'd take the second inning or the ninth inning and treat it the same, and that's really important."

The southpaws' impact has been on display in the team's series in Washington. Rodriguez entered a tie game on Friday in the seventh and pitched 1 1/3 scoreless, retiring a pair of tough righties in Anthony Rendon and Ryan Zimmerman. It was deja vu on Saturday, when he again entered a tie game in the seventh, this time striking out Bryce Harper with two runners on base. Howell closed out the eighth by retiring Denard Span with two more aboard.

"It's nice to have two guys, that's for sure," Dodgers manager Don Mattingly said of his lefties. "And both of those guys really are not bad against righties, and that kind of helps, too. A lot of times, you see what [Nationals manager Davey Johnson] does -- and a lot of different managers do it. They're gonna put some righties in between their lefties, if they can, to make you go through a righty to get to the next lefty -- or you've got to use one guy. So it's nice to have that lefty that gets the [right- and left-handed hitters] out."

Righties are hitting .253, but with only a .342 slugging percentage, against Howell. They've managed a .137 average against Rodriguez, almost identical to his number against lefties.

Although Mattingly still uses him somewhat sparingly against tough righties, Rodriguez has been earning more difficult and higher-leverage assignments. He believes the key has been getting his sinker and changeup to the inner half of the plate, something that's easier to accomplish with his cutter and slider.

"It helps me out a lot," said Rodriguez, "because it keeps them off balance and I'm able to throw all my pitches -- and it just keeps them guessing."

Dodgers give slumping Puig day off

WASHINGTON -- No player can maintain the type of pace Yasiel Puig set during his logic-defying first month in the Major Leagues. The Dodgers' rookie right fielder finally has run into a snag in July, and on Sunday, manager Don Mattingly gave him a day off to rest and regroup in the team's series finale against the Nationals.

"I can't say I'm shocked this happened at some point, because it happens to everybody," Mattingly said. "The fact that we saw him six weeks in Spring Training and basically six weeks here and not really any of it, you kind of figured he'd get his hits all the time."

In 13 games since July 3, Puig is 12-for-54 (.222) with two doubles, no home runs, three walks and 19 strikeouts. He went hitless and struck out five times over the first two games of the Washington series, making him 0 for his last 11.

"He seemed a little lost the last couple days," Mattingly said. "He's kind of confused at the plate, so give him a day to watch."

Puig's slide began when he left a game at Colorado after running into the right-field wall and injuring his left hip. But Mattingly does not believe the slump is a physical issue, based on the way Puig is taking batting practice, running the bases and playing defense.

The issue lies with Puig's approach. In Mattingly's view, the 22-year-old isn't swinging at good pitches and is getting "caught in between" looking for fastballs or offspeed pitches. On Saturday, he seemed to be behind on several fastballs, despite his explosive bat speed.

"It's pitch recognition, but it's kind of what they're doing to him," Mattingly said. "He sees what they're doing to him, but he's caught in between on which way to go with it. But again, it's going to get back to swinging at strikes. You're looking for one or the other, but you still have to get a strike. Just because you get what you're looking for, if it's not on the plate, it doesn't really matter. It can be off a little, but it can't be way out of the strike zone."

Worth noting

• As expected, catcher A.J. Ellis and left fielder Carl Crawford both were back in the lineup on Sunday after getting days off.

• Sunday marked the first day all season that Mattingly wrote out a lineup card featuring Crawford, Matt Kemp and Hanley Ramirez.

"Well, here we go," the manager said. "Let's see what it looks like."

Andrew Simon is a reporter for MLB.com. Follow him on Twitter @HitTheCutoff. This story was not subject to the approval of Major League Baseball or its clubs.