MLB probing Nats GM Mike Rizzo

NEW YORK -- Major League Baseball is investigating the conduct of Washington Nationals general manager Mike Rizzo in the immediate aftermath of Thursday afternoon's 1-0 loss to the New York Mets, a spokesman for the commissioner's office confirmed.

The umpiring crew complained to MLB about alleged verbal mistreatment from Rizzo after a controversial call went against the Nationals in the ninth inning Thursday.

Replays appeared to show Mets first baseman Daniel Murphy's foot was pulled off the bag before he accepted a throw from third baseman Justin Turner on a ninth-inning grounder by Nats outfielder Jayson Werth. However, first-base umpire Phil Cuzzi called Werth out. That prompted an on-field complaint from Werth and then manager Jim Riggleman, but the public portion ended with no ejections.

Mets closer Francisco Rodriguez then proceeded to record the final out to strand the would-be tying run at third base.

"What did I see? He was safe," said Nats starting pitcher Livan Hernandez, who broke up a no-hit bid by Mets rookie Dillon Gee with two out in the sixth. "[Werth] beat him two times. He was safe when the guy got off the bag and he was safe because he beat the throw. I think [Cuzzi] made a big mistake, the umpire there, because it's not about his foot is off the bag. It's safe because he beat the throw. He was safe two times."

Werth was more restrained after the game, telling reporters: "I've been over it for a while."

The umpires had raised eyebrows the previous day by allowing play to continue through what was at points a driving rainstorm.

Adam Rubin covers the Mets for ESPNNewYork.com.