The right-hander will get a chance to beat Washington for the third time in as many tries this year when the teams face off Wednesday night.
Volstad (5-8, 4.63 ERA) is 2-0 with a 1.69 ERA versus the Nationals this season after going 1-1 with a 6.48 ERA in his first four career starts against them.
His only complete game of the season - and second of his career - came against Washington (49-64), giving up four hits and striking out a season-high eight in a 7-1 win May 1.
Since being recalled from Triple-A New Orleans, Volstad has made three starts, going 1-0 with a 3.78 ERA. In his last appearance, he surrendered two runs and eight hits in 5 2-3 innings of a 5-4 loss to Philadelphia on Thursday.
“I’m pleased with his last outing. I saw some improvement there,” manager Edwin Rodriguez told the Marlins’ official website. “I know that he still has a lot to offer, and we haven’t seen the best of Volstad yet. I know that he’s working hard. He’s getting the right frame of mind. He’s staying aggressive.”
“When you see guys smacking doubles and hitting home runs, everyone kind of gets up for that,” said Mike Stanton(notes), who also doubled off Strasburg. “You want to knock him out early. That’s what happened.”
In his second start after missing more than two months due to shoulder tightness, Olsen gave up five runs and seven hits in 5 2-3 innings of a 6-1 loss to Arizona last Tuesday.
He won his lone start against the Marlins this season, going six scoreless innings in a 7-1 victory April 30. In his career, Olsen is 1-1 with a 4.70 ERA against the team with which he spent his first four big-league seasons.
The Nationals will try to avoid a fourth straight loss.