Jordan Ponticelli scored a brace as Coventry City boosted their League Two play-off bid with a 2-1 success at mid-table Crawley Town.Ponticelli grabbed the decider 12 minutes from time to give the Sky Blues their first win in four games and put them back into seventh place.Coventry got off to an ideal start with teenager Ponticelli firing them ahead in only the fifth minute following a Marc McNulty cross after Crawley failed to clear from a free-kick.Fit-again Dutch striker Thomas Verheydt had a goal-bound shot blocked by goalkeeper Lee Burge before the hosts levelled when defender Lewis Young rifled a low shot into the corner after 13 minutes.Jonson Clarke-Harris, one of four changes made by Sky Blues boss Mark Robins, had a powerful drive tipped over by keeper Glenn Morris midway through the half.Morris was called into action again just before the interval when he saved a shot from Liam Kelly after Karlan Ahearne-Grant dwelt on the ball.Crawley skipper Jimmy Smith, on his 150th start for the club, should have hit the target when he was off target in front of goal after being set up by Ahearne-Grant. Top-scorer McNulty came close to restoring City's lead after 72 minutes when his goal-bound shot was deflected over by Morris.But Morris was beaten six minutes later when forward Ponticelli fired the winner with an angled shot after being set up by substitute Max Biamou.