Washington fired manager Matt Williams on Monday, after the Nationals finished 83-79 and failed to make the playoffs after entering the season with World Series aspirations.

General Manager Mike Rizzo delivered the news to Williams in the Nationals Park manager's office the morning after Washington finished the regular season seven games behind the New York Mets in the NL East.

"This entire season was a disappointment," Rizzo said. "It was not our best year. It wasn't Matt's best year. It wasn't my best year. As an organization, it wasn't our best year."

In February, the Nationals exercised Williams' 2016 contract option. But he presided over a 2015 season filled with defeats, discord and a dugout dustup between NL MVP front-runner Bryce Harper and teammate Jonathan Papelbon during a game the day after the team was eliminated from playoff contention. Williams said he had no idea of the extent of the skirmish until much later in the day.

"Not one single incident was the tipping point of making a decision with Matt Williams," Rizzo said.

Williams' string of open-to-second-guessing bullpen choices began last year during Washington's NL Division Series loss to San Francisco. He also was unable to overcome the roster's long list of injuries. The ideal lineup was available for only two games all season.

"We had some things that went sideways and we had a whole bunch of injuries," Williams said Sunday, "and not much you can do about that except adjust and move on."

The Nationals also said they will not renew the contracts of Williams' staff, which includes bullpen coach Matt LeCroy, a former Twins catcher.

•The Padres fired interim manager Pat Murphy, who took over when Bud Black was let go on June 15. San Diego has had five straight losing seasons. The team finished 74-88, fourth in the NL West, 18 games behind the Los Angeles Dodgers.