Washington won 5-4 on New Jersey's home ice.
It is the first time in the club's history that they have won all matches against one and the same opponent in one season.
- I do not think it is something that you even think about at the beginning of the year.
You only think about taking one match at a time, says Washington coach Peter Laviolette.
- I think we have played good hockey against them.
We have shown that we are a veteran team, says Washington's Carl Hagelin.
Hagelin accounted for Washington's 4-2 goal, but the goal that received more attention was 3-1 from superstar Ovetchkin.
It was the Russian's 725th goal in the NHL.
Ovetchkin thus climbs the record list of most league goals and is now six goals behind Marcel Dionne in fifth place through the ages.
However, he has scored as many goals in powerplay as Brett Hull, 265, and it is the second best in NHL history, nine behind Dave Andreychuk.
The 3-1 goal was a return after a shot from radar partner Nicklas Bäckström in the middle of the second period.
Ovetchkin is also noted for two assists.
New Jersey's Jesper Bratt scored one goal.