Ottawa, which set the record of 48 wins in 2000-01, is within two points of tying the franchise mark of 107, also set two seasons ago.
The Senators are the only Canadian team to have three seasons of 100 or more points since 1992-93 and are trying to become the first team north of the border to win the Presidents’ Trophy since the 1988-89 Calgary Flames finished with 117 points.
Ottawa leads the Dallas Stars by two points for the NHL’s best record.
The Senators returned home from a four-game road trip Tuesday and settled for a 2-2 tie with the Colorado Avalanche.
Captain Daniel Alfredsson collected his 51st assist after missing Saturday’s game at Florida with a hip injury.
Washington is 2-2-0 on a six-game road trip and trails first-place Tampa Bay by four points.
A loss by the New York Rangers on Wednesday clinched a playoff berth for the Capitals. The Capitals are headed to the postseason for the 18th time and could finish anywhere from fifth to eighth.
Washington trails fifth-place Toronto by five points, leads seventh-place Boston by two and leads the eighth-place New York Islanders by five.
Ottawa leads the season series, 2-0, and has outscored the Capitals, 11-4. The teams conclude the season series at the MCI Center on April 3.