Pompey will look to equal a record when they travel to the Keepmoat Stadium to face Doncaster this weekend.
Only once before – going all the way back to 1899 – have the Blues started a regular league campaign with five successive victories.
That was under Frank Burrows in 1979/80 season, which ended up with them securing promotion from Division Four.
Now, following wins over Luton, Blackpool, Oxford and Bristol Rovers, Pompey have a chance to match the feat by beating Grant McCann's men.
Their opponents are currently in seventh position, having collected seven points from the opening four matches.
Successive triumphs over Southend and Wycombe were followed by defeat at Burton and a draw with Shrewsbury.
Carabao Cup progress away to Scunthorpe also means they have a second round clash with fellow third tier outfit Blackpool on Tuesday evening.
Pompey conceded twice in the opening five minutes to go down 2-1 at Doncaster last term, while the return fixture finished all square at 2-2.
Pompey are almost at full strength, with Dion Donohue the only absentee having not quite fully recovered from a groin problem.
Doncaster have no injury concerns, with former Blues loanee John Marquis likely to be lead the line for the hosts.
HEAD TO HEAD
Pompey: 10 wins
Doncaster: 6 wins
Pompey: 5 wins
Doncaster: 3 wins
Pompey fans can buy and collect tickets from the Club Doncaster Academy – next to the away end – on the day of the game.
Click here for a guide for visiting fans that has been produced by the home side.
Overseas subscribers and match pass holders can watch the action – now with on-screen graphics – and commentary will begin from around 10 minutes before kick-off.
ALSO IN LEAGUE ONE
AFC Wimbledon v Sunderland
Blackpool v Accrington
Bradford v Wycombe
Bristol Rovers v Southend
Charlton v Fleetwood
Gillingham v Coventry
Luton v Shrewsbury
Oxford v Burton
Plymouth v Peterborough
Rochdale v Walsall
Scunthorpe v Barnsley