Doug Fister signs one-year deal with Astros (with spring uniform photos)

Free agent right-hander Doug Fister has signed a one-year, $7 million deal with the Astros after pitching the last two seasons for the Nationals.

Washington acquired Fister from the Tigers in December 2013 in exchange for infielder Steve Lombardozzi, left-hander Ian Krol and minor league lefty Robbie Ray. Fister became arguably the Nationals' most effective starter in 2014, going 16-6 with a 2.41 ERA and winning the only game for Washington in the National League Division Series.

Fister, who turns 32 next week, struggled out of the gate last season and eventually ended up on the disabled list in mid-May with tightness in his right forearm. He missed more than a month and never quite regained his velocity upon returning. In early August, after going 4-7 with a 4.60 ERA in 15 starts, Fister lost his spot in the rotation to 22-year-old rookie right-hander Joe Ross.

Fister finished his season in the bullpen, where he was used just 10 times over the final two months, though he did record his first career save in an extra-inning victory over the Phillies on Sept. 14.

Right-hander Jordan Zimmerman previously left in free agency this offseason, signing a five-year, $110 million deal with the Tigers.

Though Fister's base 2016 salary is $7 million, incentives could push the value for the deal to $12 million.

Without Zimmermann and Fister this season, the Nationals are likely to roll out a starting rotation including aces Max Scherzer and Stephen Strasburg, lefty Gio Gonzalez, and right-handers Tanner Roark and Ross.

Note: The Nationals have unveiled the caps and uniforms they will wear this spring for Grapefruit League games.