It was a strong looking home line up with on loan Adam Collin in goal while Barry Robson, Cammy Smith and Craig Storie have all featured in the first team in recent weeks. For striker Joe Nuttall it was a first start after a long injury lay off.
Veteran Robson was prominent early on as he sprayed the ball around trying to create an opening but it was Hearts who came closest to scoring when a deep Liam Smith cross was knocked back into the middle by McLean only for Robbie Buchanan to miss his kick on the edge of the six yard box.
The visitors were nearly made to pay dearly as the Dons broke forward and Frank Ross was unlucky to see his twenty yard effort cannon to safety off the post with keeper Mason well beaten.
Russell McLean, who would prove to be the Hearts hero, came close again on 12 minutes after linking up well with fellow striker Buchanan.
Joe Nuttall looked certain to score just after the half hour mark when Mason spilled a Rose cross but he was crowded out by the visitors? defence.
Shortly after the big striker was almost through when he won a chase for the ball with Mason but he was forced wide and couldn?t get a shot on goal.
Hearts broke up the park immediately and Russell McLean found himself clear and showed great coolness to roll the ball past Adam Collin from the edge of the box to give the visitors the lead.
Scott Wright forced Mason into a sharp save just on the half time whistle but the Dons went in trailing despite some good play, mostly orchestrated by the evergreen Robson who was showing a great appetite for the game.
Shortly after the interval, Frank Ross was forced off after failing to recover from a first half knock and he was replaced by Connor McLennan.
Hearts were smothering the game in midfield and Mason was well protected by his defenders as the Dons struggled to create any clear cut openings.
Hearts almost snatched a second goal just after the hour mark when Morrison made a purposeful run forward before crashing a fine shot off Collin?s right hand post.
Ten minutes later the Dons produced their best move of the game to fashion an equaliser. Robson?s fine through ball was picked up by Scott Wright who flicked it on to Orsi. The big striker knocked the ball on for Storie and his 12 yard shot gave Mason no chance.
Barry Robson almost gave the Dons the lead when he beat two men in the box but his parting shot was too straight and the keeper saved well.
Just as the game looked to be heading for a share of the spoils, the ball was played in from the left and McLean turned his man to shoot past Collin?s right hand and claim victory for the visitors.
Five players were booked in a competitive match ? Rose and Wright of the home side and Liam Smith, Kyle Smith and Buchanan from Hearts.
It was a poor performance from the Dons who just never got going at any point this afternoon.