The unbeaten league run now spans four months and 14 days.
There have been scares along the way, admittedly, yet Kenny Jackett’s gutsy side remain unconquered in their past eight League One matches.
It took Brett Pitman’s 87th-minute penalty to preserve their pride on Saturday, as Shrewsbury were denied at the death.
In terms of this season, that is now seven league matches unbroken, positioning the Blues in second spot.
Still a little way to go until matching Harry Redknapp’s nine-match unbeaten start to the 2002-03 campaign.
In a season which would yield promotion to the Premier League, the maiden loss was registered at Norwich on September 21, 2002.
Iwan Roberts’ winner nine minutes from time settled the issue in the Canaries’ favour.
Regardless, Pompey went on to tally just one defeat in their opening 14 Division One fixtures.
The next league loss didn’t arrive until November – with Leicester City triumphing 2-0 at Fratton Park in the infamous rain-affected encounter.
Micky Adams’ side, of course, finished six points behind the Blues’ title-winners to claim second spot.
Back to the present, Pompey’s last league loss occurred on April 28, 2018, with a 1-0 deficit at Bury’s Gigg Lane.
George Miller’s second-half goal won it for the relegated Shakers, making it five fixtures without victory for Jackett’s visitors.
Subsequently, the Blues triumphed in their last match of the campaign against Peterborough to claim eighth.
Brett Pitman scored twice, while Alex Bass made his Football League debut in the 2-0 success at Fratton Park.
Intriguingly, both sides meet on Saturday, with the Posh undefeated this term and top of the league.
Throughout Jackett’s side’s unbeaten league run this season, there has been admirable defiance demonstrated by his troops.
Luton should have won the opening game of the campaign, while the visit to Bristol Rovers saw a dogged display clinch a late win.
Pompey somehow survived a wretched first half at Doncaster, before comfortably being the better side after the break.
Then there was Shrewsbury. Yet Jackett’s side possess guts, character, desire – and an unbeaten league record.
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