Stevenage's League One play-off semi-final first leg against Stockport County ended in heartbreaking fashion as Ben Osborn's stoppage-time goal gave the visitors a 1-0 win. The hosts had chances to take the lead, with Carl Piergianni missing two headers, but it was Stockport who capitalized on a lapse in concentration to score with the final kick of the game. Kyle Wootton, playing as a makeshift centre-back, almost opened the scoring for Stockport from an Ollie Norwood corner in the first minute. Adama Sidibeh wasted the first real opening of the game, mistiming his pass to Louie Barry, who would have been in on goal had he connected. Jordan Roberts headed the first effort on target for Stevenage, but Corey Addai collected it easily. Roberts again forced Addai into a save from the edge of the area a minute before half-time. Dan Kemp had a sight of goal four minutes after the restart, but his shot was tame and drifted wide. Sidibeh almost capitalized on a poor clearance by Piergianni on the hour mark, but he was stretching for it and hooked his first-time shot wide. With the game petering towards stalemate, Benony Andresson robbed Piergianni before slipping at the vital moment, and Osborn was on hand to finish. The win gives Stockport the advantage ahead of Wednesday's return leg. Stevenage will need to regroup and find a way to break down Stockport's defense if they are to turn the tie around. The club's fans will be hoping for a stronger performance in the second leg. And with the play-offs on the line, Stevenage's players will be giving it their all to try and progress. But for now, they are left to ponder what might have been after a frustrating loss. The final whistle blew with Stockport celebrating a hard-fought win, while Stevenage were left to pick up the pieces.