St Mirren's Euro hopes will go to the last day after Stephen Robinson's men fought back from 2-0 down to draw 2-2 with Hibernian.
Two quickfire goals for the visitors in the first 10 minutes gave the Buddies an uphill challenge from the off. But Richard Taylor pulled a goal back in injury-time at the end of the first-half before substitute Conor McMenamin levelled in the second-half. Mikael Mandron scored a third for Saints but the goal was disallowed after the referee seemingly pulled it back for a foul earlier in the build-up.
The manager stuck with the same starting lineup that defeated United at Tannadice on Saturday, while Mark O'Hara came on to the bench after a hamstring injury ruled him out at the weekend.
The visitors, knowing they could potentially seal third place, made a fast start and opening the scoring with just three minutes on the clock when Martin Boyle lashed beyond Zach Hemming at the near post.
The Australian international scored again three minutes later, but an offside flag denied him an early brace with VAR confirming. But the Hibees would get their second on nine minutes when Mykola Kuharevich scored.
Boyle could have added his second and Hibernian's third when he raced down right-hand side, but Hemming was quickly off his line and smothered the attempt.
After a tough start, Saints began to settle after the half-hour mark. A good cross from Ryan Alebiosu found Jonah Ayunga in the box but the forward's header was tame and gathered with ease by Hibs goalkeeper Jordan Smith. Two minutes later, Killian Phillips wasn't far away as he reacted to some pinball in the box, but flicked his effort over the bar. Saints almost saw the deficit halved when Lewis Miller made a meal of his attempted clearance of a Phillips cross, but it fell on the wrong side of the post.
The Buddies would pull a vital goal back on the stroke of half-time when Richard Taylor fired home via a deflection in the final minute of added time.
The second-half didn't really spark into life until Saints made a triple substitution a little after the hour mark with the introduction of Scott Tanser, Mark O'Hara and McMenamin in place of Declan John, Caolan Boyd-Munce and Ayunga.
Saints levelled four minutes later when McMenamin got himself on the end of an Idowu cross to score his second goal in as many games. A lengthy VAR check for offside ensued, but the goal stood.
The SMiSA Stadium was rocking and it exploded five minutes later when Mandron rolled home into an empty net as it looked like Saints had taken the lead. But referee Chris Graham pulled play back and awarded Hibernian a free-kick, much to the confusion of everyone in the stadium.
It was all one way traffic as the Buddies look to grab a winner. Substitute Greg Kiltie almost made an instant impact when he forced an important save from Smith before McMenamin cracked the post in the final minute of normal time.
While a tough trip to Celtic awaits on the final day, the Buddies will take the fight for that Euro spot until the end.
Full-Time: St Mirren 2-2 Hibernian
St Mirren: Hemming, Fraser (c), Gogic, Taylor, Alebiosu, Boyd-Munce (O'Hara 61), Phillips, Idowu (Kiltie 82), John (Tanser 61), Ayunga (McMenamin 61), Mandron
Subs Not Used: Urminsky, Iacovitti, Smyth, Scott, Mooney
Hibernian: Smith, Miller, Bushiri, Iredale, C.Cadden (O'Hora 84), Triantis, Levitt, Obita (N.Cadden 76), Boyle (c) (Gayle 84), Kuharevich (Bowie 61), Hoilett (Campbell 76)
Subs Not Used: Bursik, Ekpiteta, Manneh, Moriah-Welsh
Referee: Chris Graham
Assistant Referee: Graeme Stewart
Assistant Referee: Sean Carr
VAR: Don Robertson
Attendance: 7,671