Chris Millar then speared in a 20-yard drive that Jaakkola needed two attempts to gather.
Chris Millar had Saints' best efforts, the midfielder forcing a save from Neil Alexander in each half.
Chris Millar gave the home side a 19th-minute lead with a shot from outside the penalty area.
With almost 20 minutes played, Chris Millar watched a shot from distance glide over the bar as St Johnstone stepped up their attacks.
Dave MacKay and Sheridan missed the target for Saints early in the second period and Michael Duberry and Chris Millar drew saves from Stack.
Steve Lomas' side kept up the pressure and Chris Millar floated a cross over from the right that was won in the air by Liam Craig.
The visitors then looked to capitalise on Hibs' slackness as Chris Millar ran on to a loose pass out of defence but the midfielder's shot was charged down.
Steven MacLean fed Michael Paton who flicked the ball over last defender Chris Millar, ran in on goal but pulled his shot narrowly wide of Graeme Smith's left-hand post.
The two sides traded blows early on, with Ryan Stevenson sending a snap shot over from 15 yards and Chris Millar looping a drive just wide at the other end.
Saints took the lead when Chris Millar's ball down the right flank allowed Samuel to beat the covering Andy Graham with his pace and the Trinidad and Tobago international's cut-back from the bye-line was perfect for May to score from eight yards.
British hopes rest with Steve Cummings, second in the Tours of Britain and of Denmark, and David Millar, with back up coming from Geraint Thomas, Ian Stannard and Chris Froome.
应用推荐