Manchester City 1-1 Portsmouth
Yakubu's first-half goal looked to be enough for Pompey
David Sommeil scored a last-gasp equaliser as Manchester City avoided defeat in their first Premiership match at the City of Manchester Stadium.
The defender struck in injury time to cancel out a first-half goal from Pompey's Nigerian striker Yakubu Ayegbini.
Portsmouth - who beat Aston Villa 2-1 in their opening Premiership match - were again impressive and looked on course for their first win at City since 1973.
In contrast, City were disappointing in front of the 48,000 sell-out crowd and struggled to produce the fluency that saw them beat Charlton 3-0 last weekend.
The performance of striker Robbie Fowler summed up the malaise affecting the side and he was replaced by Paulo Wanchope at half-time.
Fowler has scored only twice since his £5m move to City in January and his lack of form must be an increasing concern for City manager Kevin Keegan.
24 mins: Ayegbini rounds Seaman to put Portsmouth ahead.
45 mins: Wanchope comes on for City in place of the ineffective Fowler.
90 mins: Sommeil heads a late equaliser for City.
Keegan started with the side that had beaten Charlton so impressively last Saturday.
And Sebastien Schemmel, making his debut in place of the injured Hayden Foxe, was the only change to the Pompey team that defeated Aston Villa.
The game started scrappily and there was little goalmouth action early on, although Fowler did receive treatment in the area after being caught late by a challenge from Schemmel.
There had been little prospect of a goal before a series of errors gifted Pompey their opener.
Sommeil let the ball bounce beyond him and Yakubu capitalised, gathering before sprinting clear of Sylvain Distin.
City keeper David Seaman was a little slow coming off his and Yakubu rounded him before slotting into an empty net.
Keegan brought Wachope on at half-time in an effort to turn the match and City were more threatening after the break.
Shaka Hislop had to be sharp to save a venomous free-kick from the otherwise ineffective Michael Tarnat and Shaun Wright-Phillips went close with a low drive.
Then Sommeil headed home from a Joey Barton free-kick in injury-time to atone for his earlier error and lift the sell-out crowd.
Man City: Seaman, Jihai, Sommeil, Distin, Tarnat, Wright-Phillips, Barton, Sibierski (Berkovic 64), Sinclair, Fowler (Wanchope 45), Anelka.
Subs Not Used: Weaver, Wiekens, Tiatto.
Booked: Barton, Tarnat.
Portsmouth: Hislop, Schemmel, Zivkovic, Stefanovic, De Zeeuw, Stone, Quashie, Faye, Berger (Harper 82), Sheringham, Ayegbini (Pericard 74).
Subs Not Used: Wapenaar, O'Neil, Primus.
Booked: Faye, Pericard, Zivkovic.
Referee: M Messias (N Yorkshire).