Jack McInerney's 73rd-minute goal was all the Union needed to stake a 1-0 win over the Revolution at PPL Park on Saturday.
Union keeper Zac MacMath made three saves to earn his eighth shutout of the season and help the eighth-place club notch their third win in their last four.
With the loss, the Revolution's record dropped to 7-17-8 (29 points) while the Union upped their mark to 10-15-6 (36 points).
Feilhaber sent off: Benny Feilhaber earned a red card dismissal after he was cautioned in the 86th and 88th minutes. Saturday's ejection marked the second time in as many seasons that Feilhaber received an early exit against the Union. On July 17, 2011, the central midfielder was awarded yellows in the 49th and 66th minutes before he was sent to the locker room.
McInerney to the rescue again: McInerney's goal was his second game-winning goal against the Revolution this season. On July 29, the 20-year-old striker scored an 89th-minute goal at the far post to lift the Union to a 2-1 win.
Scary moment: The Revolution averted danger in the 12th minute when McInerney applied a heavy challenge on a ball that Kevin Alston tried to shepherd to Bobby Shuttleworth. But as McInerney converged, Alston and Shuttleworth collided, and both appeared shaken up in the immediate aftermath. Both remained in the game without any lingering aftereffects.
Union tough to break: The Revolution will have to wait until 2013 at the earliest to find their first win against the Union, who entered the league in 2010. With Saturday's loss, the Revolution's mark against the Union stands at 0-4-3 all-time.
Soares gets early exit: Center back AJ Soares came out in the 61st minute after he was on the receiving end of a few hard challenges. Soares was substituted for midfielder Fernando Cardenas, which forced a few positional switches for Alec Purdie and Ryan Guy.
Shutout mark set: The Revolution's 1-0 loss set a franchise record for attacking shutouts in a single season. The previous record was 11, a mark originally set in 2010 before the club tied the record last week after a 2-0 loss to the Dynamo.
Purdie sees first MLS start: Rookie midfielder Alec Purdie earned his first start of the season, featuring on the left side of the midfield for the Revolution on Saturday. He racked up his first MLS shot on goal in the 42nd minute and later dropped back to play right back after the hour mark. Prior to Saturday's start, Purdie had made four cameo appearances, his last coming on May 12 against Vancouver.
Next up: The Revolution will close out their 2012 home schedule on Oct. 20 when they host the Chicago Fire at Gillette Stadium. The game will kick off at 7:30 p.m.