The Mets are due to face Tanner Roark, Gio Gonzalez and Doug Fister in the final road series of the season.METS (76-80, third place/NL East) vs. WASHINGTON NATIONALS (91-64, first place/NL East)

Tuesday: RHP Bartolo Colon (14-12, 4.02) vs. RHP Tanner Roark (14-10, 2.85), 7:05 p.m. ET

Wednesday: RHP Dillon Gee (7-8, 3.88) vs. LHP Gio Gonzalez (9-10, 3.74), 7:05 p.m. ET

Thursday: RHP Zack Wheeler (11-10, 3.49) vs. RHP Doug Fister (15-6, 2.55), 7:05 p.m. ET

Nationals short hops

• Ryan Zimmerman returned to the lineup Saturday after missing 55 games with a Grade 3 hamstring strain. He started in left field -- a position at which he debuted June 3. Zimmerman, under contract for five more seasons, could shift to first base in 2015 with Adam LaRoche potentially headed to free agency, despite LaRoche’s production. The Nats and LaRoche have a mutual option for next season at $15 million.

• Denard Span has 179 hits -- four shy of matching Cristian Guzman's 2008 total for the most in a season in Nationals history. The Nats intend to pick up a $9 million option on Span for next season.

• Gio Gonzalez is 3-1 with a 2.79 ERA in his last six starts. He has struck out 29 and walked seven in 38 2/3 innings during that span.

• Doug Fister's 15 wins are a career high, surpassing last year’s total with the Detroit Tigers. His 2.55 ERA ranks fifth in the National League.

• The Nats are the lone NL team with four players with at least 80 RBIs: Ian Desmond, LaRoche, Jayson Werth and Anthony Rendon.

• At 4-0 in his career, Tanner Roark has more wins against the Mets than versus any other club.

• The Nats, fresh off a four-game sweep at Miami, own an NL-best 91-64 record and are holding off the Los Angeles Dodgers for home-field advantage.

• The Yankees claimed outfielder Eury Perez off waivers from the Nats on Monday. The Nats claimed shortstop Pedro Florimon off waivers from the Minnesota Twins.