You could make a timeline of how many different ways the Cleveland Browns have found to lose this season. In Week 15, it was about having a two-possession lead in the fourth quarter, only to fall to the Arizona Cardinals by a final score of 20-17 in overtime.
This was the season debut of Seneca Wallace at quarterback, with Colt McCoy still out with a concussion. He led the Browns down the field on the first drive, capped off with a Peyton Hillis touchdown run. At the beginning of the second quarter, Phil Dawson tacked on a 44-yard field goal to make it 10-0 Cleveland.
The Cardinals went hurry-up in the final two minutes of the half and got a touchdown pass from John Skelton with 0:19 left on the clock, making it a 10-7 game at the half. The third quarter went back-and-forth without much scoring, but then Wallace scrambled out on a play toward the end of the third quarter and found rookie receiver Greg Little down the field. Little caught the pass and outraced his defender to the end zone for a 76-yard touchdown pass. Cleveland was up 17-7 heading into the fourth quarter.
Arizona did a good job putting together another touchdown drive mid-way through the fourth, but the Browns still had a three-point lead at 17-14. On Cleveland's next possession, Wallace was ruled upon replay review as having fumbled the football with Arizona coming up with the recovery. The Browns' defense held, but Arizona was well within range to kick a game-tying field goal.
From there, the game went into overtime. Cleveland got the ball first and missed an opportunity to hit Mohamed Massaquoi on a deep/extended play. The Browns punted the ball, and after keeping it away from Patrick Peterson all game long, Peterson did his work to get a 32-yard return. The Cardinals didn't need to do much to get into field goal range, but they were aided when the defense let Larry Fitzgerald get wide open near the sideline and close to the end zone. On first-down, Jay Feely kicked the game-winning 22-yarder.
I don't know if you could pin this loss on any one player. It was just another "collective" effort of the team not being able to close games.