SYDNEY has survived a late charge to pip Adelaide by one point and strengthen its grip on a finals spot.
But the Crows' playoff hopes ended with the heartbreaking 11.8 (74) to 10.13 (73) result on a rain-soaked Adelaide Oval on Saturday night.
The Swans were 44 points up late in the second quarter but Adelaide stormed in the final term, booting 4.8 to 0.1 only to fall just short.
Crow Ben Keays thought he'd given his side the lead with 60 seconds to go but his shot was judged to have grazed the goalpost.
Sydney takes seventh spot by two premiership points into their last home-and-away game - an SCG clash against top-four fancy Melbourne.
But 13th-placed Adelaide's chances of sneaking into the finals disappear.
Swans winger Errol Gulden continued his fine season with 30 disposals, Chad Warner (25 touches) was a standout and Oliver Florent (21) and Tom Papley (one goal) had patches of influence.
Electric Papley steps up with slippery stunner
Tom Papley slots this sensational dribble goal midway through the second quarter
Heeney's scoring polish in attack was supported by Hayden McLean (two goals), while Nick Blakey (21 disposals, seven marks) was prominent in Sydney's stingy defence.
Adelaide entered the round as the competition's highest-scoring team but failed to flourish in attack until the last-term press.
Taylor Walker and Josh Rachele kicked two goals each and Crows on-ballers Rory Laird (31 possessions), Matt Crouch (26) and Jake Soligo (28) revelled in the wet.
The Swans found four goalkickers in their strong 4.3 to 1.3 opening term, and when Heeney slotted two goals in 90 seconds - a roved snap followed by a set shot - Sydney's lead blew out to a dangerous 30 points.
Heeney double blow continues Swans' roll
Isaac Heeney boots back-to-back majors to further extend his side's lead early in the second term
Adelaide's Harry Schoenberg replied before the Swans stamped their authority with three consecutive goals creating a 44-point advantage.
Crows forwards Walker and Shane McAdam scored late to reduce Sydney's lead to 32 points at half-time, 9.5 to 4.3.
Adelaide couldn't make inroads in a slog of a third quarter although Izak Rankine produced a highlight as both teams scored two goals.
Watch The Highlights
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01:14
Round 20 Team Selection, presented by QBE
Hear from Swans senior coach Dean Cox as he goes over the two changes for Sydney Derby XXXI.
Team Selection -
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12:42
Roos and Longmire Unscripted, Episode 2: The '05 Finals Series
Presented by Bird in Hand.
Features -
04:58
Swans and Superheroes presented by Superhero - Episode 13 (Nick Blakey)
In partnership with Superhero and presented by Hamish McLachlan, this series will delve deep with the biggest names in the Sydney Swans football team. We’ll explore their greatest influences, their deepest fears about the future and their hopes for what lies ahead. From the highs on the field to the quiet moments of reflection off it, the stories shared offer a glimpse into their transformation from boys to men and from heroes to superheroes. Each week two Superhero Swans will go head-to-head for your votes, you will have the power to decide who claims victory and go into the running to win a Corporate Box for eight at the SCG for Round 23. Vote now at https://tb.sydneyswans.com.au/tb_app/522336
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00:28
Mark of the Week - Round 19
Two big intercept marks set the tone early for the boys. Mark of the Week, presented by Qatar Airways
Mark of the Week -
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00:29
Goal of the Week - Round 19
Errol launches it from 50 for our Goal of the Week, presented by Origin Energy.
Goal of the Week -
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Rankine collected possession on the boundary and, from the tightest of angles, threaded an instinctive checkside goal.
The Crows turned 32 points down and were given a pulse with three consecutive goals inside four minutes to start the final term.
After a series of behinds, Keays celebrated what he believed was the go-ahead goal with a minute remaining only to be denied.
"We got the win which is all that matters": Heeney
Hear from Isaac Heeney who talks about that frantic finish, milestone man Nick Blakey and returning to the SCG next weekend for a crucial clash.
ADELAIDE 1.3 4.3 6.5 10.13 (73)
SYDNEY 4.3 9.5 11.7 11.8 (74)
GOALS
Adelaide: Walker 2, Rachele 2, Schoenberg, Rankine, McAdam, Crouch, Milera, Murphy
Sydney: Isaac Heeney 3, McLean 2, Wicks, Papley, McDonald, Hayward, Francis, Campbell
BEST
Adelaide: Crouch, Laird, Soligo, Rankine, O'Brien
Sydney: Heeney, Warner, Gulden, Blakey, McLean, Hickey
INJURIES
Adelaide: Sloane (eye)
Sydney: TBC
SUBSTITUTES
Adelaide: Luke Pedlar (replaced Rory Sloane in the third quarter)
Sydney: Ryan Clarke (replaced Tom Papley in the fourth quarter)
Crowd: TBC at Adelaide Oval