Young stormed his way into the end zone 6:01 into the extra period, with the Redskins scoring on their first drive after winning the coin toss at the end of regulation.
“They’ll definitely be more aware of DY — the ‘three-touchdown fullback,’” quarterback Robert Griffin III said with a smile.
Washington blew a 10-point lead in the final minutes of the fourth quarter, but a goal-line stand at the 1-yard line helped send the game to overtime.
Griffin III completed 23 of 32 passes for 291 yards with one interception and ran six times for 17 yards.
Alfred Morris rushed 25 times for 121 yards and a score, Pierre Garcon had seven receptions for 172 yards, and the defense intercepted Philip Rivers twice as the Redskins (3-5), despite their record, remained competitive in the weak NFC East.
Rivers was 29 for 46 for 341 yards with two touchdowns for the Chargers (4-4).