Washington Nationals' Bronson Arroyo pitches against the Houston Astros in the first inning of a spring training baseball game, Thursday, March 10, 2016, in Viera, Fla. (AP Photo/John Raoux)
Washington Nationals starting pitcher Max Scherzer throws before a spring training baseball game against the New York Mets, Thursday, March 3, 2016, in Viera, Fla. (AP Photo/John Raoux)
Washington Nationals' Danny Espinosa swings at a pitch during an intrasquad baseball game at a spring training workout, Sunday, Feb. 28, 2016, in Viera, Fla. (AP Photo/John Raoux)
Washington Nationals pitcher Gio Gonzalez (47) runs sprints with teammates during a spring training baseball workout, Saturday, Feb. 20, 2016, in Viera, Fla. (AP Photo/John Raoux)
Washington Nationals players gather on the field for a spring training baseball workout, Sunday, Feb. 22, 2015, in Viera, Fla. (AP Photo/David Goldman)
Washington Nationals pitchers, from left, Bronson Arroyo, Lucas Giolito, Stephen Strasburg, A.J. Cole and Taylor Hill run sprints after a spring training baseball workout, Saturday, Feb. 20, 2016, in Viera, Fla. (AP Photo/John Raoux)
FILE - In this July 23, 2015, file photo, Washington Nationals starting pitcher Doug Fister (58) delivers in the first inning of a baseball game against the Pittsburgh Pirates in Pittsburgh. Right-hander Doug Fister and the Houston Astros have agreed to a one-year contract. The 31-year-old was 5-7 with a 4.19 ERA in 15 starts and 10 relief appearances last season for Washington. (AP Photo/Gene Puskar, File)
Washington Nationals' Bryce Harper connects for a single off Colorado Rockies starting pitcher Jorge De La Rosa during the first inning of a baseball game Wednesday, Aug. 19, 2015, in Denver. (AP Photo/David Zalubowski)
Washington Nationals' Ian Desmond scores from third base on a wild pitch thrown by Colorado Rockies starting pitcher David Hale during the fifth inning of a baseball game Tuesday, Aug. 18, 2015, in Denver. (AP Photo/David Zalubowski)
San Francisco Giants pitcher Madison Bumgarner works against the Washington Nationals in the first inning of a baseball game Sunday, Aug. 16, 2015, in San Francisco. (AP Photo/Ben Margot)
Washington Nationals starting pitcher Max Scherzer stands on the mound after giving up a home run to the San Francisco Giants' Matt Duffy in the first inning of their baseball game Friday, Aug. 14, 2015, in San Francisco. (AP Photo/Eric Risberg)
San Francisco Giants pitcher Ryan Vogelsong works against the Washington Nationals in the first inning of a baseball game Thursday, Aug. 13, 2015, in San Francisco. (AP Photo/Ben Margot)
Washington Nationals starting pitcher Jordan Zimmermann throws to the plate during the first inning of a baseball game against the Los Angeles Dodgers, Wednesday, Aug. 12, 2015, in Los Angeles. (AP Photo/Mark J. Terrill)
Washington Nationals starting pitcher Joe Ross leaves the field as he is pulled from the game after Los Angeles Dodgers' Yasiel Puig hit a triple to score Jimmy Rollins, Alberto Callaspo and Yasmani Grandal during the fifth inning of a baseball game, Tuesday, Aug. 11, 2015, in Los Angeles. (AP Photo/Danny Moloshok)
Washington Nationals' Ian Desmond, right, crosses the plate in front of Los Angeles Dodgers catcher A.J. Ellis after hitting a solo home run during the eighth inning of a baseball game, Monday, August 10, 2015, in Los Angeles. (AP Photo/Danny Moloshok)
Washington Nationals starting pitcher Max Scherzer (31) throws during the third inning of a baseball game against the Colorado Rockies at Nationals Park, Sunday, Aug. 9, 2015, in Washington. (AP Photo/Alex Brandon)
Washington Nationals' Bryce Harper slides safely into home on a double by Ryan Zimmerman during the fifth inning of a baseball game against the Colorado Rockies at Nationals Park, Saturday, Aug. 8, 2015, in Washington. (AP Photo/Alex Brandon) **FILE**
Washington Nationals starting pitcher Joe Ross throws to an Arizona Diamondbacks batter during a baseball game in Washington on Thursday, Aug. 6, 2015. The Nationals won 8-3. (AP Photo/Jacquelyn Martin)
Washington Nationals' Yunel Escobar (5) walks to the dugout after making the last out of a baseball game against the Arizona Diamondbacks at Nationals Park, Monday, Aug. 3, 2015, in Washington. The Diamondbacks won 6-4. (AP Photo/Alex Brandon)