Now they just have to wait and see where they land on the table.
The Sparks scored a six-wicket win over the Northern Brave at Bay Oval on Saturday.
The victory shifted the Sparks to the top of the table on 28 points. Wellington, who have now dropped to second on 24 points, still play Auckland (today) and Northern (Thursday) and will go in favourites for those games.
If they secure victories, Otago will fall back to second place — and will then play in the elimination final.
Canterbury beat bottom-placed Central by 45 runs yesterday to move to 16 points. The Magicians, Northern (also 16 points) and Auckland (14) are still fighting for a playoff spot.
Sparks captain Hayley Jensen, who was promoted up the batting order to No3, was in great form, whacking 49 runs off 34 balls to help bring them home.
“It’s nice to contribute with the bat," Jensen told TVNZ.
“When I have to go out there with only a few balls, I feel like I try and overhit, so it was nice to spend a little bit of time and I guess my role was to try and dominate the spinners, which I think I did pretty well.”
Jensen acknowledged Wellington still had a couple of games in hand and they were coming home strongly.
"They’re going to be hard to beat. We’re just grateful that we get to play next week."
Otago made a fine start with the ball when Emma Black opened with a maiden over to start an excellent spell from the seamer.
Eden Carson picked up the prized wicket of Sri Lankan Chamari Athapaththu with her first ball.
Otago restricted Northern to 29 for one at the end of the power play then removed the danger woman two overs later.
Northern captain Jess Watkin, who was superb when she faced the Sparks in Dunedin last time, was caught in the deep by Carson for 31.
Samantha Barriball was then bowled by Felicity Robertson for one and Nensi Patel cut her shot straight to Gordon for two.
Otago picked up wickets at regular intervals and Jensen trapped Northern top-scorer Caitlin Gurrey for 39.
Northern started to crumble and finished at 127 for eight at the end of their innings.
Suzie Bates and Bella James set the Sparks off well in reply, before Bates skied a shot and was caught.
James was then stumped for 17 and the Sparks were 44 for two in the fifth over.
Jensen was joined at the crease by Olivia Gain.
Gain did not last long and went for two, leaving the Sparks 48 for three at the end of the power play.
While it was not the ideal scenario, the Sparks were still on track and ahead of where Northern were at the same time.
Jensen started to wind up, dropping down to one knee to pummel a big six down the ground.
That helped propel the Sparks forward, and Jensen smacked five fours and two sixes to add to the tally.
Polly Inglis found the gap for four to give Sparks a six-wicket win.
Northern
J Watkin c Carson b Jensen 31 (29)
C Athapaththu c Gordon b Carson 2 (4)
C Gurrey lbw b Jensen 39 (35)
S Barriball b Robertson 1 (3)
N Patel c Gordon b Browning 2 (7)
M Lamplough b Gordon 3 (7)
H Topp c Gordon b Black 4 (3)
C Agafili c James b Gordon 9 (8)
J Prasad not out 23 (13)
M Downes not out 8 (11)
Extras (5w) 5
Total (8 wkts, 20 overs) 127 (129)
Fall: 1-11, 2-43, 3-47, 4-50, 5-70, 6-86, 7-90, 8-98.
Bowling: E Black 4-1-25-1, H Jensen 4-032-2 (4w), K Gordon 4-1-19-2, E Carson 4-0-29-1, F Robertson 2-0-10-1 (1w), A Browning 2-0-12-1.
Otago
S Bates c Watkin b Prasad 15 (10)
B James st Topp b Athapaththu 17 (10)
H Jensen not out 49 (34)
O Gain c Athapaththu b Watkin 2 (6)
C Blakely b Athapaththu 17 (18)
P Inglis not out 21 (12)
Extras (4b, 1lb, 2w) 7
Total (4 wkts, 14.5 overs) 128 (90)
Fall: 1-27, 2-44, 3-47, 4-89,
Bowling: N Patel 4-0-35-0, M Downes 2-0-23-0, J Prasad 2-0-17-1, C Athapaththu 3-0-17-2 (1w), J Watkin 2.5-0-25-1, C Agafili 1-0-7-0 (1w).
Result: Otago won by six wickets.