Aberdeen have made their way into the Scottish Cup semi-finals with an assured display on their travels to St Mirren, winning 2-0.

The Dons got off to a dream start through Lewis Ferguson. Some neat work from winger Matty Kennedy found the midfielder in plenty of space and he rifled a powerful shot into the top corner eight minutes in.

Early opener. (Photo by Mark Runnacles/Getty Images)

There was little action in the first half outside the opening goal but the early stages of the second half saw Aberdeen striker Curtis Main place a diving header into the net- but his effort was ruled out for offside. Sam Foley pulled Sam Cosgrove down in the box in stoppage time as the clinical forward secured cup progression.

Jim Goodwin had spoken of omens going into this. He captained St Mirren to League Cup quarter final victory over Aberdeen in 2012, going on to win the full thing in 2013. Another quarter final was upon him at St Mirren and the Irishman was hoping it was a sign that the stars would align for him again.

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But Ferguson made sure that those dreams remained distant inside ten minutes. His link-up play with Kennedy had the Paisley defence at sixes and sevens before the Scotland youth international powered the ball past Vaclav Hladky.

Into the lead. (photo by Vagelis Georgariou/Action Plus via Getty Images)

Rain and wind was swirling and there was little pretty football to report on inside the opening 30 minutes alongside that. It had became a midfield scrap with occasional high balls and niggly fouls, a bit like the 0-0 draw both sides played out in January.

The key difference was that Aberdeen were in front and were determined to hold onto it, perhaps add to that advantage. Whilst Goodwin’s side had got forward, McInnes’ were doing so with a little more threat.

Jon Obika was getting some rough treatment from the Dons back four whilst Kennedy looked like the away side’s biggest threat. An unorthodox source, centre-back Conor McCarthy got a glimpse at Joe Lewis’ goal from a Cammy MacPherson free kick but he couldn’t beat the Aberdeen skipper.

McCarthy had gone close. (Photo By Ben McShane/Sportsfile via Getty Images)

A close first half set the scene for a big second 45. The rain had stopped pouring and both sets of supporters were hoping things would be a bit brighter going into the second half.

St Mirren started the half well, forcing two corners inside the first five minutes. Worryingly for McInnes, his star centre-half Scott McKenna suddenly sat down with an injury problem.

He limped off the field as his boss was left with some defensive worries. There was almost some instant pain relief when Kennedy whipped in another dangerous ball but Main’s resulting header wouldn’t stand.

Not standing. (Photo by Scott Baxter/Getty Images)

Jamie McGrath would test Lewis after the hour mark as the Aberdeen keeper was forced into a save, albeit a pretty comfortable parry. The Buddies were carrying a bit more danger though as they looked to get back on level terms in this tight contest.

Seifedin Chabbi was introduced for his debut with 19 minutes to go. The striker had been deadly in Austria alongside fellow Buddie Ilkay Durmus so Goodwin was no doubt hoping for a quick connection as the clock ticked down.

Cosgrove was brought on for Aberdeen, not a bad option to have from the sidelines with just 22 goals to his name this term. It was St Mirren who were becoming more urgent with their play, Aberdeen content to sit on what they had.

Aberdeen were happy to sit (Photo by Ian MacNicol/Getty Images)

Cosgrove had a great chance to seal things two minutes from time but could only squeeze his effort wide. He would win his side the match in stoppage time with his effort from the spot, a 23rd goal of the season. It’s Dons delight in the end and here are three things we learned.

Aberdeen’s strongest midfield?

Funso Ojo, Dean Campbell and goalscorer Ferguson made up McInnes’ midfield trio in Paisley. His engine room has had to be chopped and changed this term for one reason or another but his strongest three may have been found.

Ojo protected the back four immensely, Campbell provided technical class and Ferguson was the legs pushing things forward. They won many of their battles in Paisley and McInnes may wonder if these three provide a perfect blend in the middle.

A familiar playing field

Aberdeen are heading back to Hampden for a domestic cup semi-final and they are no strangers to Scotland’s national stadium. They were able to keep a pretty impressive run going against St Mirren.

Back to Glasgow. (Photo by Mark Runnacles/Getty Images)

That’s four seasons in a row now that McInnes has taken the Pitodrie club to Hampden. It’s a pretty decent run but they’ll need to go one step further than the three finals they’ve made in that time to make it count.

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St Mirren weren’t bad in Paisley although that’ll hardly be a tonic for their Scottish Cup elimination. They did all the gritty things pretty well in defence and workmanlike qualities were displayed in midfield.

But the final third is where their play fell apart. Dons keeper Lewis wasn’t really troubled all night and that will be a frustration for Goodwin on a disappointing evening.

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