LANDOVER, Md.

Kirk Cousins and the Washington Redskins had their easiest path to the playoffs in front of them and they gave it away with another Monday night flop.

Cousins threw an interception and lost a fumble near his goal line, and the Redskins lost control of their playoff future with a 26-15 loss to the defending NFC champion Carolina Panthers.

Washington (7-6-1) could have clinched a playoff berth by winning its final three games but now needs help. Carolina (6-8) kept its astronomical wild-card hopes alive and dealt a serious blow to the Redskins’ chances with two weeks left in the season.

“We didn’t get it done,” said wide receiver DeSean Jackson, who had seven catches for 111 yards. “Obviously it’s frustrating because we knew what we had at stake, we knew what we had on our hands and we can’t really talk about playoffs until we handle who we need to handle and play better.”

After being picked off by Kurt Coleman in the first half to set up a Carolina field goal, Cousins was sacked by Wes Horton and fumbled on the first snap after halftime as the Panthers took over at the 1- yard line. They scored two plays later to take a 20-9 lead.

Cousins finished 32 of 47 for 316 yards with far too many missed throws in a game with such high stakes. Cousins and coach Jay Gruden were at a loss to explain how the usually high-powered offense sputtered at such a key moment.

“We just never got any kind of rhythm whatsoever throughout the whole game,” said Gruden, referencing his team going 2 for 12 on third down. “Part of it was the running game was atrocious, part of it was we had no deep passing game and then the other part: Carolina was very good today.”

Reigning league MVP Cam Newton showed no ill effects from a shoulder injury suffered last week, throwing for 300 yards and two touchdowns.

“He took a little bit of a shot early on, but when he came to the sideline and had a chance to take a breath he was ready to roll,” Carolina coach Ron Rivera said.

The Panthers took advantage of blunders by the Redskins, who lost their sixth consecutive Monday night home game. It was Washington’s most lopsided loss since being routed 38-16 by Pittsburgh in the season opener, also on a Monday night.

“We didn’t play well enough to win,” Cousins said. “Just didn’t make enough plays.”