Aberdeen were held to a second successive 0-0 draw in the Scottish Premiership after a hard-fought 90 minutes against Hearts.
The Dons, who drew their opening league match at St Johnstone, went closest to scoring thorugh a Wes Burns header which struck the crossbar.
Tony Watt almost won it at the death for the Jambos but squandered a gilt-edged chance in the closing exchanges as a somewhat feisty encounter finished without a goal.
The Dons made three alterations from the side that defeated Ayr United 2-1 midweek with Kenny McLean, Adam Rooney and Andrew Considine, whose wife had given birth in the early hours of the morning, dropping to the bench. In their place came Ash Taylor, who missed the trip to Somerset Park through illness, Peter Pawlett, back available after a ban, and Jayden Stockley, who had been nursing a hamstring injury.
Hearts, who had won their last three meetings with the Dons, also made three changes with Faycal Rherras, Sam Nicholson and Tony Watt replacing Alim Ozturk, Robbie Muirhead and the suspended Jamie Walker.
Aberdeen made a strong start with Stockley heading wide from an inviting Pawlett cross before Wes Burns, man of the match against Ayr on Wednesday, drilled a shot just over from the edge of the area.
Northern Ireland international Niall McGinn was next to trouble the Hearts defence, skipping past Callum Paterson with a smart piece of skill before his effort on goal was deflected over for a fruitless corner.
The Dons almost broke the deadlock after 21 minutes when McGinn crossed for Burns but his header bounced back off the crossbar.
The visitors felt they should have had a penalty eight minutes before the break when Sam Nicholson fell in the box under a challenge from Shay Logan, which resulted in Hearts manager Robbie Neilson being spoken to by referee Kevin Clancy for his protestations.
The Tynecastle side made two changes at the break with Faycal Rherras and Prince Buaben, who had both been booked, replaced by Perry Kitchen and Liam Smith.
The Dons also didn’t wait long to shuffle their pack with Rooney and McLean brought on for Stockley and Burns 12 minutes into the second half.
Both sides were struggling to create chances in the final third, although a deflected Watt effort was well handled by Joe Lewis, while his counterpart Jack Hamilton looked less assured as he fumbled a McGinn cross under no pressure.
Hearts had a chance to win it with four minutes remaining when Sammon squared for Watt but the on-loan Charlton Athletic forward lost his composure at the vital moment.