The Portland Sea Dogs, like their major league affiliate in Boston, are not having the most successful season.

So when Marco Hernandez led off the first inning with a home run, maybe the Sea Dogs would get on a roll like the Red Sox did Tuesday.

But Portland managed only three more hits as the Binghamton Mets beat the Sea Dogs 6-1 on Tuesday night at Hadlock Field.

The biggest highlight, besides Hernandez’s blast, was a replay on the Hadlock video board of Boston’s Brock Holt hitting a triple to complete the cycle.

While Boston’s record is struggling at 28-38, the Sea Dogs sunk to 25-39, including 3-12 in their last 15 games. To be fair, Portland was not expected to be a contender this year, unlike the Red Sox and their $200 million payroll.

On Tuesday, Portland ran into a young pitcher who may have figured things out. Gabriel Ynoa (3-4) turned 22 three weeks ago. He’s a Mets prospect but had allowed 21 earned runs in his last four starts, including an 8-5 Sea Dogs win on May 26.

But Ynoa was stifling on Tuesday, retiring 15 straight at one point. He allowed four hits and no walks, striking out three.

Ynoa gave up consecutive singles to Luis Martinez and Keury De La Cruz to begin the second inning. Dave Sappelt then lined out to Ynoa, who doubled up De La Cruz at first. The Sea Dogs didn’t get another hit until Oscar Tejeda’s single in the seventh.

Losing pitcher Mike Augliera (2-10) gave up eight hits and wasn’t helped by Portland’s defense, which committed four errors. Three of the five runs Augliera allowed were unearned.

Reliever Kyle Kraus gave up one run (a Eudy Pina home run) in three innings. Robby Scott pitched a scoreless ninth, lowering his ERA to 1.95.

Binghamton second baseman L.J. Mazzilli, son of a former Met, Lee Mazzilli, had three hits.

NOTES: The announced paid attendance was 3,178. … Sea Dogs starting pitcher Luis Diaz (0-5, 7.04 ERA) was placed on the disabled list retroactive to June 11. … Reliever Miguel Celestino was sent to Portland from Pawtucket, where he had a 3.67 ERA. … Last week the Red Sox signed outfielder Dave Sappelt and assigned him to Portland. Sappelt, 28, came from the Mexican League, where he was batting .335 for Campeche. Sappelt has 95 games of major league experience from 2011-13 with the Reds and Cubs …

Part of Wednesday’s “Welcome to Summer” promotion will be plenty of Jimmy Buffet music. … Thursday’s game begins at 6 p.m. because fireworks will follow. … The Eastern League All-Star Game is July 15 in Portland. Fans are able to vote online for one pitcher and one position player from their hometown team (see for information). Voting ends June 25. … In Triple-A, Justin Masterson made another rehab start for Pawtucket (six innings, three hits, one earned run, three walks, four strikeouts). … Former Portland reliever Pat Light pitched a hitless eighth inning. Since being promoted to Pawtucket, Light has appeared in three games, retiring all nine batters he’s faced, four by strikeout.