Dodgers left-hander Clayton Kershaw comes off the disabled list on Tuesday and will start against the Nationals at Nationals Park.
He pitched for the Dodgers on Opening Day in Australia and gave up one run while earning the win against the D-backs, but he hasn't pitched since because of a muscle strain in his back. Kershaw has been on the disabled list since March 30.
Kershaw is 5-2 with a 3.18 ERA in nine career outings (eight starts) against the Nationals. Kershaw was 2-0 with a 1.15 ERA in two games against Washington last year. He fanned 20 and walked just one against the Nationals.
At the last minute, the Nationals needed a starter for Tuesday and decided to call up Blake Treinen, who made a great impression during Spring Training.
In four starts, he allowed two earned runs in 11 2/3 innings. This will be Treinen's second trip to the big leagues and his first career start. In April, he allowed a run in 6 2/3 innings.
At Triple-A Syracuse, Treinen allowed two earned runs in 11 1/3 innings.
"Treinen will start the game for us, hopefully will go deep into it," manager Matt Williams said. "Blake has been starting and he has been in that regular rotation. We certainly wanted to stay away from [Craig] Stammen as much as possible."
To make room for Treinen, the Nationals sent reliever Ryan Mattheus to Triple-A Syracuse.
Dodgers: Could Greinke start sooner?
Right-hander Zack Greinke pitched just three innings in Monday's 4-0 loss to the Nationals because of a three-hour, 17-minute rain delay. But Greinke and manager Don Mattingly will be talking about if Greinke can make his next start sooner because of the short outing.
Greinke threw just 54 pitches.
Nationals: Barrett solid in relief
Reliever Aaron Barrett has been a solid reliever ever since he joined the Nationals, allowing one run in 9 2/3 innings. He picked up his second victory of the season on Monday against the Dodgers after pitching one inning.
"[Anthony] Rendon hit the home run … Jordan [Zimmermann] pitched four great innings and the rest of the bullpen shut it down," Barrett said. "I was the next guy in line. It was a great team win."
• Carl Crawford's batting average jumped 25 points to .225 after his 3-for-4 effort in Monday's 4-0 loss. He singled in the third, sixth and eighth innings.
• Pedro Baez, the Dodgers' 10th-ranked prospect, made his Major League debut in Monday's game. He came on in the eighth inning and pitched one inning, giving up two hits and two runs, both coming on Danny Espinosa's homer. He struck out two.
• Dodgers reliever Chris Withrow saw his ERA slide down to 0.61 with his scoreless sixth inning Monday night. He's allowed just one earned run in 14 2/3 innings this season.
• Nationals center fielder Denard Span had three hits and saw his batting average go up to .252.
• Left-hander Jerry Blevins has been a solid reliever for the Nationals, allowing five runs in 15 innings with 19 strikeouts.
Bill Ladson is a reporter for MLB.com and writes an MLBlog, All Nats All the time. He also can be found on Twitter @WashingNats. This story was not subject to the approval of Major League Baseball or its clubs.