The Marlins will look for their league-high 20th win in the month of May on Tuesday, and they'll turn to perhaps their steadiest starter to do so.
Sanchez -- who owns a 7-0 record and 2.10 ERA in 111 2/3 innings against Washington -- will look to move past his last appearance, a forgettable outing amid a season filled with quality starts. On Thursday, Sanchez surrendered a season-high five runs on seven hits in 5 1/3 innings of a 14-7 loss to San Francisco. That snapped a string of eight consecutive quality starts to begin the season.
"That's baseball," Sanchez said. "I think every pitcher has situations like that. I'm not perfect. I'm human. I'm always going to the mound looking for a win, not just for me, but for the team. I like this team. I'm just working hard for it."
The Nationals will counter Tuesday with Edwin Jackson, the tough-luck righty who has posted a 2.95 ERA over his last six starts, despite an 0-1 record to show for it. The Nationals are just 1-5 in those six contests.
In his last outing, Jackson allowed three runs in seven innings of a 4-1 loss to Philadelphia. Despite the lack of run support, the 28-year-old wasn't satisfied with his own performance.
"I just got to come out and do it from the first batter on," Jackson said. "It's just a matter of keeping the ball down, regardless whether they are hard-hit balls or softly-hit balls. A hit is a hit. You just have to come out and try to keep it down and execute."
Marlins: Oviedo hit with eight-week ban
Major League Baseball suspended reliever Juan Carlos Oviedo for eight weeks for "engaging in age and identity fraud." The suspension took effect on Monday and will run through July 22.
Oviedo, formerly known as Leo Nunez, spent nearly eight months in the Dominican Republic dealing with legal issues relating to his identity. He was granted a visa to return to the United States on Friday.
The right-hander had 36 saves in 42 opportunities last season before being placed on the restricted list late last September. He is eligible to participate in extended spring camp during his suspension.
Nationals: Tracy lands on DL
Washington placed infielder Chad Tracy on the 15-day disabled list with a right adductor strain on Monday. Tracy is scheduled for an MRI exam on Tuesday.
Tracy injured his groin during Saturday's 8-4 win against the Braves.
"Hopefully he won't need surgery," manager Davey Johnson said. "He's another one [who's] valuable that we'll lose."
Nationals outfielder Michael Morse is scheduled to begin a rehab assignment Tuesday with Class A Potomac.
Marlins outfielder Austin Kearns, on the 15-day DL with a right hamstring strain, is optimistic he can return on June 7, the earliest date he is eligible to be activated.