Game 157 lineups: Nats vs. Diamondbacks (torn ACL for Ramos)

We just got word just yet on Wilson Ramos' MRI, and it's not good: He has torn the ACL in his right knee and will have surgery sometime in the next week, ending his season (and potentially his Nationals career, since he's going to be a free agent). Plenty more coming on that, but in the meantime the club has called up Spencer Kieboom from Double-A Harrisburg, giving them three healthy catchers (along with Jose Lobaton and Pedro Severino) and incredibly a full 40-man active roster. (Kieboom had been the lone 40-man player not in the big leagues.)

Dusty Baker suggested he plans to use both Lobaton and Severino over the next week, with Severino in particularly starting against left-handers because Lobaton still has trouble swining from the right side due to a longstanding elbow injury.

As for tonight's game, Lobaton is behind the plate, working with Max Scherzer, who seeks his 19th win and a stronger case for National League Cy Young Award voters. Rookie right-hander Matt Koch makes his first career start for the Diamondbacks, having pitched well in five relief appearances so far...

ARIZONA DIAMONDBACKS at WASHINGTON NATIONALS
Where: Nationals Park
Gametime: 7:05 p.m. EDT
TV: MASN2, MLB.tv
Radio: 106.7 FM, XM 183, MLB.com
Weather: Clear, 70 degrees, wind 5 mph right field to left field

NATIONALS (91-65)
CF Trea Turner
LF Jayson Werth
2B Stephen Drew
3B Anthony Rendon
1B Ryan Zimmerman
RF Brian Goodwin
SS Danny Espinosa
C Jose Lobaton
RHP Max Scherzer

DIAMONDBACKS (65-91)
2B Jean Segura
3B Jake Lamb
1B Paul Goldschmidt
C Wellington Castillo
LF Brandon Drury
RF Yosmany Tomas
SS Chris Owings
CF Mitch Haniger
RHP Matt Koch