KILMARNOCK, Scotland (Interstat) — In a stunning Scottish Premiership upset that defied overwhelming statistical projections, Aberdeen FC rode a first-half goal from substitute Stuart Armstrong to a 1-0 victory over Kilmarnock on Wednesday at a rain-swept BBSP Stadium, Rugby Park.

The match, a physical and often ill-tempered affair that featured 10 yellow cards, saw the visiting Dons defy a pregame projection from Interstat that gave Kilmarnock a 90.50 percent probability of victory and predicted a 2-0 win for the home side. Instead, Aberdeen’s disciplined defensive performance and a moment of quality from a veteran midfielder secured a perfect start to their league campaign.

From the opening whistle, the game was played at a frenetic pace, with Kilmarnock applying early pressure in front of their home supporters. The match’s physical nature was established early, with the first of many cautions issued by the referee in the 25th minute to Aberdeen’s Graeme Shinnie.

The game’s decisive moment arrived in the 18th minute, breaking against the run of play. A well-constructed move from Aberdeen, involving midfielders Greg Kiltie and David Watson, found its way to Armstrong, who had entered the match as an early substitute. The experienced midfielder made no mistake, firing a clinical finish past the Kilmarnock goalkeeper to silence the home crowd and give the Dons a shock lead.

Armstrong’s goal, the only one of the contest, completely altered the dynamic of the match. Kilmarnock, now chasing the game, saw their frustrations mount as their attempts to find an equalizer were repeatedly met with stubborn resistance from the Aberdeen backline and a series of fouls that disrupted the match’s flow.

The first half concluded with a flurry of disciplinary actions, as Kilmarnock’s Marko Lazetić and David Watson were both shown yellow cards in quick succession around the half-hour mark.

The second half continued in a similar, stop-start vein, with Kilmarnock dominating possession but struggling to create clear-cut chances against a well-organized Aberdeen defense. The home side’s increasing desperation was matched by a rise in cynical fouls, leading to a parade of bookings.

Kilmarnock’s Brad Lyons was cautioned in the 59th minute, followed by Greg Kiltie and Jesper Karlsson of Aberdeen, who were both booked within a minute of each other around the 67th minute. Kilmarnock defender George Stanger also received a yellow card during that contentious period.

As the clock wound down, Aberdeen effectively managed the game, using substitutions and tactical fouls to break up Kilmarnock’s rhythm. The visitors saw Dylan Lobban and Dante Polvara enter the referee’s book in the 78th and 81st minutes, respectively. The final caution of the match was issued to Aberdeen goalkeeper Dimitar Mitov in the second minute of stoppage time, a final act of defiance from a team determined to protect its narrow lead.

When the final whistle blew, it confirmed a monumental victory for Aberdeen and a bitterly disappointing start for Kilmarnock. The result sees Aberdeen begin their Premiership season with a perfect record of one win and zero losses, while Kilmarnock starts with zero wins and one loss. The records for both clubs across all competitions are identical to their new league standings.

The victory, secured through a combination of a timely goal and resolute, if sometimes overly aggressive, defending, provides a massive morale boost for an Aberdeen side that was given little chance by pregame analytics. For Kilmarnock, the defeat raises immediate questions after a performance where their high expectations and significant possession failed to translate into a result on the scoreboard.