And while the Knicks have beaten both Chicago and Portland this season, both of those victories were in New York.
The last time an N.B.A. game went into a fourth overtime was March 16, 1984, when Chicago beat Portland by 156-155.
In 2000, they overcame a 16-point deficit late in the third quarter to beat Portland in Game 7 of the Western Conference finals.
Notre Dame (24-1), ranked second and seeded No. 2, is the only team in the past two years to beat Portland, which finished 19-1-2.
Dallas rallied from a 19-point deficit to beat Portland in 1984.
Washington won on the road for the first time since beating Portland Nov. 12.
"If we got together last week and said we're going to beat Boston, Detroit, Portland and the Knicks, you'd probably all have me committed."
On Friday night in Game 3, Phoenix beat Portland, 123-89.
Notre Dame beat Portland, 1-0, in the other semifinal on a goal by Kathryn Sobrero in the 52d minute.
Mourning had 14 points and 12 rebounds last night as the Nets beat Portland, 64-60, in his first start this season.