Pompey began the new season by collecting a point from a dramatic League One contest with promotion favourites Sheffield Wednesday.
Marvin Johnson had fired the hosts into an early lead, but there was nothing else to shout about during a lethargic first half.
The game exploded into life after the break, though, with a glut of four goals in the space of just 14 minutes.
Connor Ogilvie nodded the Blues back on level terms, only for Fisayo Dele-Bashiru to immediately restore the Owls’ lead.
But the visitors did not let that deflate them, with Michael Jacobs and Colby Bishop netting in quick succession to turn the contest on its head.
Ultimately, however, they had to settle for a share of the spoils after an impressive equaliser from Dele-Bashiru.
Pompey then had strong shouts for a penalty turned down, while Lee Gregory was dismissed for Wednesday late on.
Danny Cowley handed out plenty of competitive debuts, with starts for summer signings Josh Griffiths, Joe Rafferty, Michael Morrison, Joe Pigott and Bishop.
Marlon Pack was also named in the line-up, although he had already made a couple of first team appearances during his first spell with Pompey.
Teenage Tottenham loanee Dane Scarlett, the latest player to arrive at Fratton Park, was included among the substitutes.
Regular skipper Clark Robertson missed out through injury, so the captain’s armband was worn by Sean Raggett.
The rain was falling in South Yorkshire and the spirits of the large army of travelling supporters were dampened soon after kick-off.
Josh Windass collected a fine threaded pass from Barry Bannan and his low delivery across the face of goal was not dealt with.
That allowed Johnson to collect the ball and rifle it into the roof of the net to give the home side the lead after just eight minutes.
There was little else to excite the sizable crowd for the rest of the half, with neither team able to register another shot on target.
Sheffield Wednesday enjoyed more of the possession, but were unable to force Josh Griffiths into action.
The closest that Pompey came at the other end, meanwhile, was a long-range Ronan Curtis effort that was scuffed past the post.
And the away supporters also grew frustrated by a series of marginal calls from referee Sebastian Stockbridge that went in favour of the Owls.
The hosts looked to extend their advantage just before the break, but Dele-Bashiru was unable to find the target.
Half Time: Sheffield Wednesday 1 Pompey 0
Sheffield Wednesday had a good opportunity once the action restarted, but nobody could get on the end of Jack Hunt’s drilled delivery into the box.
But the Blues had their first shot on target just a few moments later, as Jacobs cut along the edge of the box and curled the ball into the arms of David Stockdale.
And they were soon celebrating an equaliser when Pack stood the ball up for OGILVIE to guide home a fine header.
The joy was short-lived, however, as Dele-Bashiru collected the ball 30 yards out and hit a fierce effort that flew into the net.
But the second half was proving much livelier than the first and it was soon the away fans who were roaring.
Curtis and Pigott combined well on the right and the latter delivered a cross for Bishop that was tipped against the bar by Stockdale.
It might have bounced down over the line, but JACOBS made sure by stooping to nod into the net.
An incredible start to the second half continued in the same vein just past the hour mark, as the Blues scored again to lead for the first time.
Curtis again combined well with Pigott and the striker crossed for fellow debutant BISHOP to head home.
The Owls tried to respond and Rafferty somehow managed to divert Gregory’s effort over the crossbar.
Former Pompey defender Darren Moore then swapped one ex-Fratton player for another, bringing on Michael Smith for George Byers.
Cowley responded with a couple of changes of his own, as Pigott and Jacobs made way for Scarlett and Reeco Hackett.
Wednesday were on the attack and it took a fantastic block from Pigott to stop Michael Ihiekwe’s powerful header from crossing the line.
The hosts did level from the resulting corner, however, with the ball eventually falling to Dele-Bashiru, who hit an unstoppable rocket that almost burst the net.
Seven minutes of stoppage-time left both sets of fans sensing they could find a winning goal at the death.
And Scarlett was fuming not to have been awarded a penalty after being caught inside the box by Dominic Iorfa.
The Owls finished with 10 men after a foul from Gregory ensured he collected a second booking of the afternoon.
Curtis had a chance that was deflected off target, but ultimately both sides would begin the campaign with a point.
Sheffield Wednesday (3-4-1-2): Stockdale; Iorfa, Heneghan, Ihiekwe; Hunt, Byers (Smith 71), Dele-Bashiru (Vaulks 90+4), Johnson; Bannan (c); Windass, Greogry
Goals: Johnson 8, Dele-Bashiru 52, 81
Sent off: Gregory (two yellow cards)
Booked: Windass, Byers, Ihiekwe, Stockdale
Subs not used: Dawson, Palmer, Famewo, James, Bakinson
Pompey (4-4-2): Griffiths; Rafferty, Morrison, Raggett (c), Ogilvie; Curtis, Pack, Thompson (Tunnicliffe 90), Jacobs (Hackett 74); Bishop (Scarlett 74), Pigott (Mingi 88)
Goals: Ogilvie 50, Jacobs 57, Bishop 64
Subs not used: Oluwayemi, Swanson, Mnoga
Referee: Sebastian Stockbridge
Attendance: 26,901 (2,135 Pompey fans)