Nine players, including Doug Fister, Stephen Strasburg and Wilson Ramos, filed for arbitration Tuesday.
Veteran left-hander Jerry Blevins continues well-traveled offseason with trip to Nationals Park for Winter Classic.
The left-handed reliever will pitch for the MLB all-star team next week in Japan.
The left-handed relievers struggled this season but has been tough against left-handed hitters, as he showed Friday.
The Nationals could choose the last reliever in their bullpen based on their NLDS match-up.
Jerry Blevins has struck out 10 of the past 15 hitters he's faced, enhancing his odds to make the Nats' playoff roster.
The series is a reunion of sorts for former players of each team, including Blevins and Gonzalez.
The entertaining left-handed reliever and his former University of Dayton teammate, Stammen, are back together.
The Nationals talked to several free agent left-handed relievers, made an offer to one and explore as many as four trade options.
The Nationals filled their left-handed relief need with a trade for Oakland's Jerry Blevins.