WASHINGTON -- Bruce Bochy made an early exit in his final game in Washington as a big league manager. With Patrick Corbin on the mound, he wasn’t surprised how it ended.

Bochy was tossed during the top of the fifth for arguing with plate umpire Ryan Additon about the strike zone, and Corbin frustrated the Giants throughout their 4-2 defeat to the Nationals in Thursday afternoon’s series decider.

Brandon Belt was also tossed in the seventh for arguing after being caught looking a second time on the day. The first resulted in Bochy’s dismissal.

“I think he’s a really good pitcher and he pitched a great game,” Bochy said of Corbin. “But it was frustrating for some of these hitters. That zone was too big. Belt had no chance.”

It was Bochy’s first ejection in this, his 25th season as a manager. He plans to retire at the end of this season, his 13th with the Giants.

San Francisco managed just two hits in 7 2/3 innings against Corbin, who struck out nine in his 26th time facing the Giants, more than he’s seen any other opponent.

Five of those K's were looking, with Steven Duggar joining Belt in being caught twice.

“I think he lives on getting those calls on the corner,” Belt said of Corbin. “And then when you start expanding off the plate to the point where, as a baseball player, we think it’s not even close ... it’s tough.”

San Francisco lefty Drew Pomeranz also got four of his seven strikeouts via the called third strike, though by the time he departed after 4 2/3 innings, he’d allowed all four Nats runs on six hits.

By contrast, the Giants had hit only one ball out of the infield before Bochy’s ejection, ending a series in which they scored all 15 of their runs in the fourth inning or later.

“We’ve got to find a way to get things going early again,” Bochy said of his club. “That’s been our issue.”

Of Corbin’s previous 25 outings against San Francisco -- all with Arizona -- this one looked reminiscent at times of the complete-game one-hit shutout he authored against Bochy’s club one year and one day prior. He’s now 9-8 all-time against his former National League West rivals.

Thursday, a no-hitter was still intact when Bochy received his marching orders after Corbin got his third called strike three for the first time on Belt.

Bochy came out of the dugout and was promptly dismissed.

“The two before that, they were close,” Bochy said. “But it got wider there. I mean, come on, that’s enough.”

Evan Longoria doubled to left-center in the next at-bat to break up the no-no, but Corbin escaped the frame with a 3-0 lead. He wouldn’t allow a run until Erik Kratz chased him with an RBI double to make it 4-1 in the eighth.

Additon sent Belt to the showers after Belt looked at another 1-2 fastball on the corner for strike three, then slammed his helmet in front of the plate.

“I probably said something -- It wasn’t very nice,” Belt said. “But like I said, we put everything we’ve got in this game. Does the game change if I get on base and Longo hits me in and we score a run out there? We don’t know. We’ll never get to know. Because it was taken away.”