The Washington Redskins shocked the Dallas Cowboys, 20-17 in overtime on Monday night thanks to a courageous effort by third-string quarterback Colt McCoy.

McCoy’s counterpart, Tony Romo, wasn’t as fortunate. Romo left the second half with a back injury – only to return for duty late in the fourth quarter and then overtime.

According to Cowboys head coach Jason Garrett, Romo suffered a back contusion and his X-rays came up negative.

Meanwhile, the 6-2 Cowboys saw their six-game winning streak come to an end despite another outstanding day from Dallas running back DeMarco Murray, who rushed for 141 yards.

McCoy’s biological football clock is ticking. After not starting for three years, he is not expected to be a long-term solution at quarterback with Robert Griffin III waiting in the wings.

Things don’t get easier for Dallas next week. They welcome NFC West leader Arizona to Cowboys Stadium on Sunday.