Dave Roberts downplayed the easy narrative on Sunday afternoon.

“No,” he said when asked if his Dodgers had the New York Yankees’ proverbial number, having followed up their defeat of the Bronx Bombers in last year’s World Series with two impressive wins to start this weekend’s rematch at Dodger Stadium.

“I think we’ve had their number the last two nights,” Roberts said, “but today’s a different day.”

Was it ever.

Twenty-four hours after a total annihilation of the Yankees in a 16-run rout on Saturday, the Dodgers suffered the kind of setback that has so often plagued them this season, squandering the chance to build further momentum in a 7-3 loss that prevented a series sweep.

For as complete a performance as the Dodgers (36-23) put together Saturday, they looked equally out of sorts in a “Sunday Night Baseball” finale, getting a rare bad start from Yoshinobu Yamamoto, mistakes on defense and basepaths that cost them early runs, and virtually nothing from a lineup that looked largely discombobulated against funky left-hander (and former Dodgers swingman) Ryan Yarbrough.

They might have come out of the weekend with a marquee series win, continuing to nurse a narrow lead in the National League West standings.

But, they invited more scrutiny over their inconsistent start to the season with a finale flop, dropping to 13-13 over their last 26 games.

“You got to focus on the positives,” third baseman Max Muncy said. “We just took two of three from a really, really good team. We’re obviously upset that we didn’t get this one. But we played two really good games. … Just [today] the result wasn’t there.”

Yamamoto had been the one constant in the Dodgers’ injury-plagued rotation. His 1.97 earned-run average was second in the NL. His 64 innings not only led the team, but were almost twice as many as anyone else besides Dustin May.

Dodgers pitcher Yoshinobu Yamamoto shouts in frustration after giving up a home run to New York’s Ben Rice in the third inning.

(Robert Gauthier / Los Angeles Times)

Yamamoto also had an impressive personal track record against the Yankees (36-22), shutting them out over seven innings in New York last June before delivering 6 ⅓ innings of one-run ball in Game 2 of the World Series.

On Sunday, however, he couldn’t consistently find the strike zone or execute his trademark splitter. And after scoring just two runs in their previous 15 innings in this series, the Yankees finally came to life at the plate.

“I was not being able to control my pitches,” Yamamoto said through interpreter Yoshihiro Sonoda. “During the game, I was trying to make an adjustment, but … I could not get it back, my stuff.”

In the first, Trent Grisham singled and Ben Rice walked before Jasson Domínguez dumped a line drive into left, driving in a run when Andy Pages airmailed his throw to home plate.

In the third, a leadoff walk to Judge was followed by a two-run homer to Rice — Yamamoto missing badly with two splitters in the first at-bat before leaving one hanging in the next.

Later in the inning, the Yankees scored again after Yamamoto gave up two singles and spiked a splitter for a run-scoring wild pitch.

Dodgers star Shohei Ohtani strikes out against the Yankees in the first inning Sunday.

(Robert Gauthier / Los Angeles Times)

And with two outs in the fourth, Roberts pulled Yamamoto, his pitch count having ballooned to 96 on a day he gave up a season-high in hits (seven) and walked three others. It was the first time this year that Yamamoto, whose ERA rose to 2.39, had failed to complete the fifth.

“He wasn’t great today, wasn’t sharp with any of his pitches,” Roberts said. “Really uncharacteristic.”

The Dodgers faltered in other ways, as well.

After his first-inning throwing error, Pages made a mistake on the bases in the second. Following a one-out double, he was thrown out on an over-aggressive steal of third. That meant that when Tommy Edman homered moments later — his first long ball in 17 games, breaking him out of a recent funk at the plate — it was only a solo blast, temporarily tying the score before the Yankees answered in the next half-inning.

There would be no counterpunch from Dodgers’ offense, which was missing Mookie Betts for a third-straight game because of a toe fracture (Betts said before the game his toe was starting to feel better, and went through pregame activities in hopes of avoiding a stint on the injured list).

Instead, Yarbrough cruised against the team that dealt him away at last year’s trade deadline.

Even though he never hit 90 mph with his fastball, he induced a string of soft contact while striking out five in a six-inning start. Yarbrough was especially effective against the top of the Dodgers’ order, which went a combined 0 for 16.

“It’s funky,” catcher Will Smith, who was batting cleanup, said of Yarbrough’s unorthodox delivery. “We gave them a little momentum. They jumped on us early [with] some long innings. So he did a good job attacking us and keeping us off balance.”

The Dodgers did show some life after Yarbrough’s exit, with Pages and Muncy each taking reliever Jonathan Loáisiga deep within the space of three at-bats.

But by then, it was much too little, much too late — resulting in the Dodgers’ second straight series in which they failed to complete a sweep, and yet another momentum-halting loss in a season plagued by a few too many of them.

“I think for us, the takeaway is we won a series and that was the goal coming in,” Roberts said. “I think at the end of the day, you keep winning series and things will take care of themselves.”