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.
TEAM NEWS
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.
VIEW FROM THE DRESSING ROOM
Read the thoughts of Joe Gallen and Anton Walkes or a register for a free iFollow account to watch the below videos.
HEAD TO HEAD
Overall
Pompey: 10 wins
Doncaster: 6 wins
4 draws
At Doncaster
Pompey: 5 wins
Doncaster: 3 wins
2 draws
TICKETS
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.
MATCH COVERAGE
Domestic iFollow subscribers can listen to live commentary from Andy Moon and John Durnin by signing into their account and visiting the match centre from 2pm on Saturday.
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.
Click here for more information about using iFollow on a matchday and click here for information on downloading the app, so you can access content on your mobile device.
We will have updates throughout the game on Twitter and the match centre. You can also see behind-the-scenes content on our Instagram story and Snapchat account.
There will be post-match reaction on the website, iFollow and our official YouTube channel, with highlights to follow on Sunday.
Local listeners can hear commentary by tuning in to either Express FM or BBC Radio Solent.
BETTING
Doncaster are the narrow 6/4 favourites with Sky Bet to secure all three points, while Pompey can be backed at 9/5.
Click here to read our full betting guide and visit www.skybet.com/pompey to earn money for the club when you place a bet. Please gamble responsibly.
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
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