Pompey’s recent run of fine form has mostly been built on collecting points against clubs not in the promotion race.
Oxford are the only victims of a seven-match unbeaten run – that includes six victories – with realistic hopes of reaching the Championship.
But that all changes on Saturday, as Danny Cowley takes his team to Portman Road to face a revitalised Ipswich outfit (3pm kick-off).
The Suffolk side spent heavily in the summer, but got off to a slow start and ex-Blues boss Paul Cook was sacked in December.
His replacement was former Manchester United coach Kieran McKenna and he has helped guide the Tractor Boys to an upturn in results.
Their own unbeaten streak currently stands at eight games and includes Tuesday night’s 2-0 home success over Lincoln.
It leaves Ipswich sitting ninth in the League One standings – just one place and two points above their visitors.
There were three meetings between the sides last season and Pompey came out on top in all of them.
As well as a 2-1 home win in Cowley’s first fixture in charge, there were Portman Road triumphs in both the league and FA Cup.
Pompey are without Kieron Freeman (ankle), Jayden Reid (knee) and Shaun Williams (back), while Michael Jacobs (knee) is a doubt.
Marcus Harness serves the second game of a three-match ban following his red card against Accrington.
Ipswich will be without George Edmundson (ankle), Kyle Edwards (quad) and Lee Evans (knee), while there are concerns over Sam Morsy (hamstring).
HEAD TO HEAD
Pompey: 16 wins
Ipswich: 20 wins
At Portman Road
Pompey: 10 wins
Ipswich: 9 wins
Pompey have sold out their full allocation of tickets and no more will be made available. Click here for more details.
Referee: Christopher Sarginson
Assistants: Paul Lister and Andrew Aylott
Fourth Official: James Vallance
Overseas subscribers and match pass holders can watch all the action live, with accompanying commentary.
There will be post-match reaction on the website and our official YouTube channel, with highlights to follow on Sunday.
We are committed to playing our part in ensuring our relationship with VBET is promoted in the right way to our supporters.
That is why VBET has partnered with BettorMind, to provide responsible gambling advice around key betting behaviours.
When it comes to betting, we advise all fans to make use of our dedicated responsible gambling site.
ALSO IN LEAGUE ONE
All games kick-off at 3pm
Accrington v Charlton
AFC Wimbledon v Lincoln
Bolton v Plymouth
Burton v Fleetwood
Doncaster v Gillingham
MK Dons v Wigan
Morecambe v Cheltenham
Sheffield Wednesday v Cambridge
Shrewsbury v Oxford
Sunderland v Crewe
Wycombe v Rotherham