Pompey were held to a disappointing point by injury-hit Mansfield this afternoon.
Andy Awford’s men had to come from behind to claim a 1-1 draw following Simon Heslop’s 46th minute goal.
Paul Robinson slotted home substitute Nigel Atangana’s pass to level on 70 minutes and grab a point.
It sparked an energetic end to the match from the hosts, but not enough to win it.
And they had Paul Jones to thank for avoiding defeat following two stunning saves from the lively Rakish Bingham during the second half.
It means Pompey have now picked up four successive draws in League Two since defeating Dagenham & Redbridge at Fratton Park.
Awford made two changes to the side which drew at York in the previous league fixture, with Johnny Ertl and Ryan Taylor coming into the side.
Jack Whatmough’s injury ruled him out, while out-of-sorts Craig Westcarr dropped to the bench.
Pompey started enthusiastically enough, but as the first-half wore on the football proved uninspiring and barely threatening.
It was awful opening 45 minutes for the hosts who failed to truly challenge the Stags’ keeper, generating plenty of frustration from the Fratton faithful.
Then 57 seconds after the restart, Heslop turned to fire in a low shot past Jones.
The Blues still couldn’t lift themselves and on 68 minutes Awford made a double substitution with Nigel Atangana and Patrick Agyemang on for Ertl and Michael Drennan.
Barely two minutes later, Shorey fed Atangana down the right and he pulled the ball back where Robinson slotted home for the equaliser.
That lifted both the fans and Awford’s side as they pushed on to finish the match strongly.
But despite having six minutes of time added on, Pompey failed to find a way through and had to settle for another league draw.