Jaylen Brown fell flat in first post-trade duel with Celtics: ‘I’m a bit frustrated’

In the weeks leading up to the first Celtics-Sixers matchup of the season, Jaylen Brown had been hyping up the reunion. But just six minutes into Tuesday night’s game, his long-awaited rivalry debut began to unravel.

Brown admitted it himself after Philadelphia’s 123-101 loss to Boston, acknowledging he and his Sixers teammates didn’t do enough to match up to the Celtics during the marquee matchup.

“I’m a bit frustrated, honestly,” Brown told reporters, per CLNS Media. “I wanted to perform better for my team. Foul trouble kind of derailed me a little bit, but it happens. It’s unfortunate. But now we gotta just move on to the next.”

Brown established himself as the aggressor from the jump. He…