PHILADELPHIA — Curtis Granderson continues to generate little interest in the trade market, a source said Sunday, though that could change if the 36-year-old outfielder keeps swinging a hot bat.

Granderson hit a two-run homer in the Mets’ 6-2 victory over the Phillies. His 17th homer of the season was part of a 3-for-5 outburst that included a double. He knocked in three runs and scored three.

“His approach to the whole game is so consistent that you just really never know when he’s not swinging because he just never makes a big deal of it,” said manager Terry Collins, who expressed surprise at the lack of interest.

Granderson has made his early-season struggles seem like ancient history. The nadir came on May 2, when he had a .122/.175/.211 slash line, one homer and six RBIs. The slumber raised questions about whether age had caught up to him.

The response has been a sustained run of production. Since May 2, he has a .271/.392/.572 slash line, 16 homers and 41 RBIs.

It has been a tribute to the even-keeled approach that has long made Granderson one of baseball’s most respected players within the clubhouse. Though players often aim for such an approach, few do it as well as he does.

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“Having done it before and having struggles whatever they happen to be over the course of the season or career, I’ve faced them,” he said. “I know I’m going to get out of them. That’s why I have a chance to be in the situation I am now. I think it’s helped me a lot, so no reason to go into panic mode.”

This week’s Subway Series could be a milestone of sorts for Granderson, who experienced the rivalry as a member of the Yankees from 2010 to 2013.

Said Granderson: “This could be the last time I get a chance to be in it like that.”

Uncertainty will color the remainder of his season. With the Mets out of contention and retooling for next season, general manager Sandy Alderson has been open about his desire to move his remaining veterans for prospects or salary relief.

Even if Granderson isn’t moved, he will be a free agent for the first time since signing a four-year, $60-million deal in 2014 that has proved to be a boon for the Mets.

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Either way, Granderson said he wants to play next season as long as teams still want him. Retirement, he insists, would be a consideration only if no teams approach him with a deal.

“If they call, great,” he said. “If not, it’s been a lot of fun . . . I’m not going to beg.”

But with his words and now his bat, Granderson has made it clear that he wants teams to call.

Notes & quotes: Righthanded reliever Kevin McGowan was promoted from Triple-A Las Vegas on Sunday, though he did not arrive in time to pitch against the Phillies. He fills the roster spot left open by the trade of Neil Walker to the Brewers. McGowan, 25, was 5-4 with four saves and a 4.06 ERA in Triple-A. The 6-5, 235-pounder was the Mets’ 13th-round selection in the 2013 draft. It was his first big league call-up . . . Yoenis Cespedes and Amed Rosario did not start the series finale. Both were given the day off ahead of the Subway Series . . . Jeurys Familia is moving closer to starting a minor-league rehab assignment, Collins said. Familia is recovering from surgery to repair a blood clot.