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6/23/2013 7:07 P.M. ET

Werth pulls left groin, hopes to avoid missing time

WASHINGTON -- Right fielder Jayson Werth left Sunday's game against the Rockies in the fourth inning after pulling his left groin. He doesn't expect to go on the disabled list and hopes to return to the lineup on Tuesday.

Werth was a late scratch from the lineup Saturday with flu-like symptoms, and he said that he was still battling the illness on Sunday. He hadn't eaten much in the past couple days and was dehydrated at the beginning of the game, which he said might have led to the groin injury.

"When you're out there sweating and you're dehydrated to start the game, you're at risk," Werth said. "I knew that going into it, so it's probably more my fault than anything else. But you want to win, you want to help your team win, and the only way I can do that is if I'm on the field."

Werth was 2-for-2 with a pair of singles before his exit on Sunday. He initially felt the pull when fielding a ball in the third inning and thought it was just a cramp. But after collecting his second hit of the day to lead off the fourth, he thought it might be worse.

"When you hit the ball normally, you take a big turn, but he shut it down early," manager Davey Johnson said. "So I knew something was wrong and I was hoping he'd start feeling better, but obviously he wasn't."

Werth came off the disabled list on June 4 after recovering from a strained right hamstring, another injury that he said might have been the result of dehydration. He has missed 31 games so far this season after missing 81 games last year with a broken wrist.

Werth was examined by Dr. Wiemi Douoguih and given fluids during the game.

"I'll know more tomorrow, but I think I'll be all right," Werth said. "Groins are pretty straightforward. I've had a couple of them in the past, but I didn't miss any time, so I hope that'll be the case."

Haren headed to disabled list with sore shoulder

WASHINGTON -- One day after his worst outing in a Nationals uniform, right-hander Dan Haren was headed to the disabled list with a sore right shoulder.

Manager Davey Johnson didn't specify the injury and only said that Haren "had trouble getting loose" before his past two starts. Haren explained that his shoulder had been feeling stiff, making it more difficult for him to bounce back in between starts.

"Nothing really major at all, nothing I haven't pitched through in the past," Haren said. "I'm not really concerned about it, but they wanted me to take some time to get 100 percent. [I] definitely don't want to use this as an excuse for the first three months of the season. That was more due to lack of execution rather than an injury, that's for sure."

While Johnson wasn't ready to announce who would start in Haren's place on Friday against the Mets, and the team had yet to announce Haren going to the DL, a source with knowledge of the situation said the team would probably call up right-hander Taylor Jordan.

Jordan, the Nationals' No. 17 prospect, is 6-0 with a 0.73 ERA in seven starts at Double-A Harrisburg. Before that, he went 2-1 with a 1.24 ERA in six starts at Class A Potomac. Jordan's fastball tops out at 96 mph. He also has a power sinker and plus breaking ball.

Haren, a three-time All-Star, was yanked after just 3 1/3 innings in the Nationals' 7-1 loss to Colorado on Saturday. He allowed six runs on seven hits, throwing two wild pitches and hitting one batter. He left the game with a 6.15 ERA, the highest in the Majors among qualified starters.

"The last two times, he had trouble getting loose," Johnson said, "and that could be a sign of a tired arm or whatever. We're not going to take any chances, we're just going to let him get healthy and finish up the way he did last year."

Pitching coach Steve McCatty said Sunday that Haren's recent struggles are at least somewhat mechanical. He has noticed a difference in the right-hander's arm slot and release. Instead of bringing his release straight down, Haren is finishing his pitches sideways, leaving the ball up in the strike zone and flattening his pitches.

Haren has a history of back and hip problems, but he said that neither has been an issue this season. However, those past ailments could have caused him to put more strain on his shoulder, according to McCatty.

"When you have a problem somewhere else, sometimes it transfers to another part of your body," he explained. "If you're hurting somewhere else or something's throwing you off, sometimes it can have an effect on your elbow, shoulder. So we've just got to make sure he feels good."

Haren will get an MRI on his shoulder in the next day or two. He said he would have prefered to stay in the rotation and try to overcome his recent struggles, but he understands why the decision to put him on the disabled list was made.

"Maybe there's a little bit of something going on in there that just a little bit of rest will get better," Haren said. "As for getting 100 percent healthy and working [on] my stuff, once I get back to feeling 100 percent, however long it takes -- a week, 10 days -- we'll go from there."

Gio, Marrero have history back to high school

WASHINGTON -- When first baseman Chris Marrero was called up to the Nationals on June 9, he saw plenty of familiar faces from his first stint with the team in 2011. And one of the new faces, left-hander Gio Gonzalez, wasn't actually a new face at all.

Gonzalez and Marrero were high school teammates for one year at Monsignor Edward Pace High School in Miami. Gonzalez was a senior and "Nene" was a sophomore third baseman. More than nine years later, Marrero is amazed that their respective careers have brought them together again.

"It's crazy," Marrero said, shaking his head. "You want to make it to the big leagues, and now you're here with somebody you know. It's fun."

Gonzalez was drafted out of high school by the White Sox and traded four times before landing in Washington. Marrero was the Nationals' first-round pick in the 2006 Draft and has been in the organization throughout his professional career.

The two were close friends in high school and had what Gonzalez called "a famous dance." Marrero said they didn't have too many crazy stories, but "probably some we can't say."

Gonzalez always knew that Marrero had Major League potential.

"BP was unbelievable watching this guy," Gonzalez said. "I remember just seeing him as a kid, still the same Nene. Tall, strong, Nene. But seeing him again now in the big leagues is unbelievable. To be with him in high school and now, it's definitely a cool story."

Worth noting

• Injured outfielder Bryce Harper took batting practice on the field before Sunday's game as manager Davey Johnson watched. Harper, who is on the 15-day disabled list with bursitis in his left knee, received a loud round of applause after he left the cage.

Johnson said that Harper will hit and participate in baserunning drills on Monday and Tuesday. The 20-year-old will likely not play at Potomac on Tuesday, as previously expected, according to Johnson, but he could play in a rehab game later in the week.

• Johnson said that Adam LaRoche was available to pinch-hit in Sunday's game, but Johnson did not go that route because there was a left-handed pitcher in the game and he wanted his younger players to get meaningful at-bats.

"They've got to contribute and do the things I know they're capable of doing," Johnson said. "I want to show them I have confidence in them in those situations."

• Danny Espinosa played shortstop for Triple-A Syracuse on Saturday. He went 1-for-4 with a double, two RBIs and two strikeouts.

Tom Schad is an associate reporter for MLB.com. Follow him on Twitter @Tom_Schad. This story was not subject to the approval of Major League Baseball or its clubs.