WASHINGTON -- Joan Adon has been getting a crash course in facing a division opponent. 

The right-hander made his second consecutive start against the Marlins on Thursday, having shut them out in his previous turn in the rotation last Friday. 

Adon looked for similar results, while the Marlins made adjustments in the Nationals’ 6-1 loss. 

“Last week, I had good feeling of all my pitches … and I felt like I had a lot more energy,” Adon said. “Today, I felt like my energy was low and I didn’t feel the same way about my pitches.” 

After beginning their last matchup with a no-hitter through 5 1/3 innings (six scoreless in total), Adon allowed five runs off nine hits, one home run and one walk across five frames to the Marlins on Thursday. He also struck out three.

“He just couldn’t repeat his mechanics,” manager Dave Martinez said. “His arm was lagging a little bit on some pitches. That’s why I think he got a little wild. We’ll get him back and get him squared away.”

A followup to Adon’s no-hit bid was eliminated in the first at-bat when he allowed a leadoff single to Luis Arraez. Bryan De La Cruz doubled to drive in the batting title front-runner for an early 1-0 Miami lead.

“I feel like they make better adjustments to you because they’ve seen you recently,” Adon said. “I felt like that first inning, I was throwing some very good changeups and, for some reason, I feel like they were reading them really well.”

Adon delivered two scoreless frames before he loaded the bases with a pair of singles, a wild pitch and a hit batter. With one out, Arraez looped one toward Michael Chavis, close to second base. Chavis let the ball drop and roll to shortstop CJ Abrams, who stepped on the base for the out and threw to third base. Jesús Sánchez scored on the inning-ending double play.

“You get a chance to turn a double play and not let Josh Bell come up there and hit, it’s pretty smart,” said Martinez.

The Nats’ deficit quickly ballooned in Adon’s final frame. He gave up a single to the former National Bell, hit Jake Burger with a pitch and surrendered a 376-foot home run to Jazz Chisholm Jr. Adon had not allowed a homer since the fourth inning of his Aug. 18 start against Kyle Schwarber and the Phillies.

“I thought [his tempo] was too slow,” Martinez said. “His last outing, when he got back out on the mound, he was going. Today, he was kind of pacing around a little bit and taking his time a little bit more than usual.”

Adon wrapped up his outing on a high note, picking off Garrett Hampson at first base to end the inning.

"He has good stuff,” said Burger. “Tonight, we shrunk him down a little bit more into the zone. He’s a great pitcher and obviously had our number last time, and so obviously, we wanted to give him one back.”

Adon is 1-3 in four career starts against the Marlins. He will not face them again this season, but if he earns a spot in the starting rotation again next season, they will continue to be a familiar face.

“A lot better at-bats [this time],” Marlins manager Skip Schumaker. “That’s the value in maybe seeing a guy for the second time in a week. You never know how that goes. It’s a chess match and our hitters did a really good job of adapting, and changing what happened a week ago.”