Barnsley's second successive goal-less draw saw their advantage in the automatic promotion places cut to just two points.
It is the first time Barnsley have drawn successive matches 0-0 since February 2017 against Preston and Reading.
Indeed it is the first time the Reds have drawn successive matches at all since December 2017.
It is the first goal-less meeting between Barnsley and Portsmouth since 1996 and is the first time since that 1995-1996 campaign that both league meetings in a season have been drawn.
This was Barnsley's fourth 0-0 of the season, their most since 2016-2017 (6)
This was the 13th time this season a Barnsley match has been goal-less at half time (all comps) and Barnsley have only gone on to win four.
It is the Reds most half-time 0-0s since 2016-2017 (17)
This was the only League One game without a goal on Saturday.
It could have been a different outcome however as Adam Davies saved an Omar Bogle penalty, the second one he has saved this season (Excluding shootouts) after also denying Peterborough's Ivan Toney in October.
Prior to that Peterborough game Davies had failed to save any of the past six penalties he had faced.
Barnsley have now won only one of their last 20 visits to Fratton Park (L13 D6), and have failed to win any of their six trips this Millennium.
The Reds have also now failed to score on five of their last six visits, the exception being a 4-4 draw back in February 2002.
This was the first time Barnsley have gone back to back league games without scoring since December 2017.
Portsmouth are now winless in eight matches in all competitions (D6 L2) - their longest winless run under manager Kenny Jackett.
And because of this Barnsley are now on their longest unbeaten run in 34 years as it is now 14 league games since they last tasted defeat, the club’s best run since the 1984/85 season under Bobby Collins (15)
Despite not scoring Barnsley did keep their 15th league clean sheet of the season, their most in a season since keeping 17 in 2015-2016 (including play-offs).
The Reds are now undefeated in six away league matches, their best run since remaining unbeaten in their final nine of 2015-2016 (including play-offs)
Barnsley have gone unbeaten in their first 10 league games of a calendar year (W6 D4) for the first time since 1939 (14 - W10 D4)
Portsmouth only managed five efforts on goal (of which three were on target) the joint lowest amount by a home team against Barnsley this season (also Fleetwood)
1. Adam Davies (c)
23. Dani Pinillos
6. Liam Lindsay
5. Ethan Pinnock
12. Dimitri Cavare
27. Alex Mowatt
8. Cameron McGeehan
21. Mike Bähre
33. Jacob Brown
9. Cauley Woodrow
26. Mamadou Thiam
29. Victor Adeboyejo (for Bähre 59)
7. Ryan Hedges (for Thiam 75)
4. Kenny Dougall (for McGeehan 90+2)
13. Jack Walton, 15. Jordan Green, 18. Adam Jackson, 20. Callum Styles.
15. Craig MacGillivray
2. Anton Walkes
6. Christian Burgess
5. Matthew Clarke
3. Lee Brown
24. Bryn Morris
33. Ben Close
7. Tom Naylor (c)
19. Viv Solomon-Otabor
22. Omar Bogle
11. Ronan Curtis
10. Jamal Lowe (for Solomon-Otabor 77)
32. James Vaughan (for Bogle 84
9. Oliver Hawkins, 17. Dion Donohue, 26. Gareth Evans, 35. Alex Bass, 38. Brandon Haunstrup.
Portsmouth manager Kenny Jackett said:
We got forward more than we have in recent times and got better service to our wide players.
“That’s our game – to give constructive passes to those guys and then have the full-backs getting round them to give more options.
“When we’re at our best, that’s what we do. I saw a lot more of that in what was a positive performance.
“We had the better chances and there were key saves from Davies in the first half, while there was more energy and cohesion in midfield.
“Obviously we’re disappointed because we really want wins and that’s five draws on the spin for us now.
“But there have been times when we’ve looked flat and lacking energy – that wasn’t the case on this occasion and we want to replicate that.”
League One results:
Saturday 23rd February 2019:
Scunthorpe United 1-1 Doncaster Rovers
Accrington Stanley 1-1 Southend United
AFC Wimbledon 1-2 Charlton Athletic
Blackpool 0-1 Oxford United
Bristol Rovers 0-2 Sunderland
Burton Albion 0-1 Fleetwood Town
Peterborough United 1-2 Shrewsbury Town
Norburn pen 28
Plymouth Argyle 5-1 Rochdale
Walsall 3-2 Bradford City
Wycombe Wanderers 0-1 Gillingham
Sunday 24th February 2019:
Luton Town 1-1 Coventry City
Barnsley remain in 2nd place in Sky Bet League One with 67 points from 34 games. We are 15 points inside the Play-Offs, 2 points inside the Automatic Promotion Places, 5 points off First Place and 33 points above the Relegation Zone.
Up to 24/02/19
On The Road:
Sky Bet League One Matchday Thirty Five: Southend United v Barnsley, Saturday 2nd March 2019. Kick-Off: 12:30pm
Sky Bet League One Matchday Thirty Six: Barnsley v Accrington Stanley, Saturday 9th March 2019. Kick-Off: 3pm