Last week, we talked about a Gossip Girl spoiler involving Blair Waldorf (Leighton Meester) and a new guy spending time together this summer.

Well, this very same guy was also spotted getting sweaty over an intense game of squash with Blair's friend/love, Chuck Bass (Ed Westwick).

So who is this guy and what’s his story?

His name is Marcus, and he is played by Patrick Heusinger.

An inside source on the Gossip Girl set says: “He’s Blair’s new love interest and Chuck’s rival. Blair met him in Europe, introduced by Ben, whom she flew to Italy with after Chuck stood her up.”

So what’s he doing playing squash with Chuck?

Observers at the Eastern Athletic Club on Clark Street in Brooklyn Heights say Chuck may be taking a page from Georgina Sparks' playbook - getting chummy with Marcus over a round of squash, earning his trust, and then trying to screw Blair over.

At the end of the squash scene, observers say Marcus and Chuck shook hands on the court and then Marcus gave Chuck a telephone number, which Chuck programmed into his cell. All very interesting ...

Thoughts on these Gossip Girl spoilers and rumors?

Steve Marsi is the Managing Editor of TV Fanatic. Follow him on Google+ or email him here.