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Joe Lewis' mistake allowed Marcus Fraser's cross into the net, resulting in St Mirren's victory
St Mirren capitalized on Teddy Jenks’ second-half red card and won against Aberdeen to win the Scottish Premiership for the first time this season.
After Connor Ronan had put the home team ahead, Scott Brown and Christian Ramirez led Aberdeen to the break.
After Jenks was given a second yellow for his late tackle on Jamie McGrath's Jamie McGrath, St Mirren seized control. Ronan added another fine finish and Marcus Fraser won the match.
Aberdeen looked set to end their seven-game streak of games without a win, which had been ended by Jenks' dismissal at 50 minutes. This was after back-to-back league losses without scoring.
After 14 minutes, Lewis gave possession away to the haphazard Lewis. Ethan Erhahon was able to slip through Ronan and fire home via a deflection from David Bates.
Aberdeen responded with dominance and dangerous crosses to the box, putting St Mirren under severe pressure.
Calvin Ramsay, a teenager fullback, was once again brilliant. His free kick caused havoc inside the St Mirren box and Ramirez eventually touched the ball off Brown to quickly level the score.
Ramsay's cultured free kick found another Ramirez, who dived to guide his header into the corner. Aberdeen took a well-deserved lead.
Jenks had been brilliant in the first period, but he lost his composure in the second. He caught McGrath's ball when he was playing for it. McGrath had already been given a yellow card.
This helped shift the momentum as St Mirren boss Jim Goodwin brought in striker Curtis Main, who was to play two up front and chase down the match.
His compatriots Ronan and McGrath were skilled enough to reward him quickly. He turned his back on Scott Brown and fed his teammate. His delay in striking stunned Bates, and allowed him to score a brilliant equalizer.
They were leading just four minutes later. McGrath was once again involved when he found Fraser at the box's edge. Lewis flung at his cross for Main, and the ball rolled into the back of Lewis' net.
Stephen Glass, Aberdeen's manager, brought forward Jay Emmanuel Thomas and Austin Samuels to the field in search for an equaliser. However, it was St Mirren’s Eamonn Brrophy who had the best chance of adding another goal. But he somehow pushed the ball wide from only five yards.
Man of the Match - Connor Ronan
Ronan (right), displayed great composure in achieving both his goals
What have we learned?
Goodwin talked pre-match about how they need to get their season started after promising performances, including four draws. This will be a boost for St Mirren.
Their creative problems continued, with Lewis' goal and a deflection being the main culprits. However, they responded well to the red card. Goodwin put Main on, and they attacked Aberdeen. They could have easily scored more at the end.
Aberdeen's defensive problems are holding them back. Lewis again was poor with two errors that led to goals. Glass may now be looking to Gary Woods as a deputy.
Bates was also lazy, having played Ronan side-by for the first goal and Main for the second. This allowed Lewis to be put off by the St Mirren forward as he raced for the ball. Ronan also deceived him for the equaliser.
Aberdeen has only kept one clean sheet in 20 games under Glass. Jenks' dismissal was evidently a turning point. However, they failed to respond and tighten up.
It had been a promising attack display up until that point. Ramsay, Hayes and Hedges caused problems. A more direct approach in third paid dividends. They will concede goals until they can regain their composure in possession. The story is not told by eight wins.
They said it!
Jim Goodwin, St Mirren manager: "There's no denying that the sending off was a significant turning point in this game. My players were able to move the ball side to side and create those gaps. I must give credit.
Stephen Glass, Aberdeen manager: "I thought that we were fine up until the redcard. It was a disappointing game that saw us lose a few goals and one in the second half.
It's a red-card offense, I agree. Although it's not what Teddy Jenks intended to do, it is a second yellow.
What's next?
St Mirren will build on their win by playing at Livingston on Saturday (15:00 BST) and Aberdeen starts a difficult run of games at Celtic on Sunday (12:00).
Player of the match Ronan Connor Ronan, with an average 7.67 St Mirren St Mirren St Mirren
Aberdeen Aberdeen Aberdeen St Mirren Avg Squad number 43 Player name Ronan Average rating 7.67 Squad number 4 Player name Shaughnessy Average rating 7.22 Squad number 7 Player name McGrath Average rating 7.07 Squad number 16 Player name Erhahon Average rating 6.91 Squad number 5 Player name McCarthy Average rating 6.82 Squad number 44 Player name Millar Average rating 6.81 Squad number 3 Player name Tanser Average rating 6.56 Squad number 9 Player name Brophy Average rating 6.46 Squad number 6 Player name Power Average rating 6.39 Squad number 17 Player name McAllister Average rating 6.27 Squad number 1 Player name Alnwick Average rating 6.24 Squad number 20 Player name Dennis Average rating 6.14 Squad number 10 Player name Main Average rating 6.06 Squad number 22 Player name Fraser Average rating 5.97 Squad number 8 Player name Flynn Average rating 5.63 Aberdeen Avg Squad number 22 Player name Ramsay Average rating 5.48 Squad number 11 Player name Hedges Average rating 5.21 Squad number 9 Player name Ramrez Average rating 5.13 Squad number 2 Player name McCrorie Average rating 4.92 Squad number 3 Player name MacKenzie Average rating 4.59 Squad number 19 Player name Ferguson Average rating 4.57 Squad number 27 Player name Bates Average rating 4.55 Squad number 8 Player name Brown Average rating 4.24 Squad number 17 Player name Hayes Average rating 4.20 Squad number 20 Player name Jenks Average rating 3.27 Squad number 23 Player name Samuels Average rating 2.91 Squad number 14 Player name Emmanuel-Thomas Average rating 2.76 Squad number 1 Player name Lewis Average rating 1.93