MI New York held the Freedom to a respectable 160-6 after winning the toss and electing to field first.
Glenn Phillips hit a 35-ball 47 while Captain, Moises Henriques, hit 32 off 30 balls for Washington.
New York skipper, Kieron Pollard, was amongst the wickets with 2-33 from his four overs.
Nicholas Pooran then starred with an unbeaten 62 as MI New York needed only 15.3 overs to reach 161-2.
The left-hander faced 33 balls and struck four fours and six sixes on his way to his first fifty of the competition.
Pooran was well supported by openers Monank Patel, who hit 44 off 29 balls, and Shayan Jahangir, who made 29. Pollard was at the crease alongside Pooran in the end, finishing 21* off just 10 balls.
The Seattle Orcas and Washington Freedom have each already secured spots in the playoffs with three teams battling for the remaining two spots.
MI New York, who play the Orcas in their last game, will be in with a win or if they avoid a heavy defeat.
The Texas Super Kings and San Francisco Unicorns are the other teams in contention for a spot and they will be facing each other in a winner-take-all clash on Monday.
After winning the toss and electing to field first, the MI New York bowlers dominated the Orcas batting, restricting them to 108 all out off 19.1 overs.
Shubham Ranjane (35), Harmeet Singh (20) and Aaron Jones (12) were the only batsmen to reach double figures for the Orcas against 3-22 and 3-25 from eight overs combined from superstars Rashid Khan and Trent Boult, respectively.
Captain Kieron Pollard also chipped in with 2-11 from his 2.1 overs.
It then took MI New York only 14.2 overs to reach 111-4 with Pooran finishing 62* off 37 balls, his 41st T20 half-century.
His knock included seven fours and two sixes.
Full Scores:
Seattle Orcas 108 all out off 19.1 overs (Shubham Ranjane 35, Rashid Khan 3-22, Trent Boult 3-25)
MI New York 111-4 off 14.2 overs (Nicholas Pooran 62*, Cameron Gannon 2-40)
The Unicorns won the toss in the winner-take-all encounter and decided to bat first.
Matthew Wade led the way with 49 while Chaitanya Bishnoi made 35 as the Unicorns posted 171-8 off their 20 overs.
Pacer Gerald Coetzee took 4-31 off his four overs for the Super Kings.
Texas then reached 172-7 with five balls to spare.
Milind Kumar set the foundation for the successful chase with a 42-ball 52 before Daniel Sams hit a whirlwind 18-ball 42 including two fours and four sixes to help seal qualification to the playoffs.
Haris Rauf and Shadab Khan each took a pair of wickets for the Unicorns.
The Seattle Orcas, Texas Super Kings and Washington Freedom have all confirmed their spots in the playoffs.
The final spot will be determined on Tuesday when the Orcas face MI New York. MI New York and San Francisco both have four points with New York ahead on net run rate. MI New York would seal their spot in the playoffs with a win or by avoiding a heavy defeat. If they lose by at least 130 runs, they would finish fifth and the Unicorns would advance.
