Colchester beat Spurs on penalties - listen on BBC Radio 5 Live
League Two Crawley shock Stoke on pens, Ings with Southampton double
Martinelli double on first start for Arsenal, Welbeck scores for Watford
Sterling and Jesus for dominant Man City before Preston OG
Calvert-Lewin with double for Everton, Leicester thrash Luton
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Portsmouth 0-1 Southampton
Nearly two goals in three minutes for Southampton.
Danny Ings, who just bagged the first goal, is through on goal but is denied by a fine stop from Craig MacGillivray but the rebound falls to Pierre-Emile Hojberg whose shot goes past the goalkeeper but Oli Hawkins is in the right place to throw his body in front of the ball and make a vital block.
Sam Vokes (23 mins)
Right place, right time! A Stoke corner isn't cleared, a shot comes in from the left of the box and it just hits striker Sam Vokes inside the six-yard box and cannons in.
A change of luck for the Potters?
Colchester 0-0 Tottenham
Halfway through the first half and the League Two side will be delighted with this so far. Yes, Tottenham have dominated possession - 72% - but Spurs haven't had a shot on target yet. Lucas Moura, Dele Alli and Troy Parrott have all had half-chances but nothing properly clear-cut yet.
Preston 0-1 Man City
A proper piece of showboating from Gabriel Jesus to flick the ball over the head of a defender, but he ends up losing it...
Watford 0-0 Swansea
Watford are knocking on the door! Midfielder Nathaniel Chalobah hits a free kick just wide.
Preston 0-1 Man City
Emlyn Begley
BBC Sport at Deepdale
Raheem Sterling, nice and rested from watching the 8-0 win over Watford, had started to grow into the game in the final few minutes as Manchester City started to dominate before scoring that excellent solo goal. Can Preston find an answer?
Danny Ings
Image source, ReutersIt had been all Portsmouth for the opening 20 minutes, but they are the ones who are now losing.
A minute before the goal Danny Ings had an effort pushed away by Craig MacGillivray, but the Portsmouth goalkeeper can do nothing about this one as Ings arrows a shot into the bottom corner to give the Premier League side the lead. That cutting edge is the difference so far.
Raheem Sterling (19 mins)
Image source, ReutersBut Raheem Sterling is the man to break the deadlock! A classy goal too, getting away from defenders to break into the penalty area and firing home via a deflection.
Image source, ReutersPreston 0-0 Manchester City
Raheem Sterling wriggles into the area from the left, gets a shot off but Connor Ripley is right behind it...
Luton 0-0 Leicester
Not too much to get excited about at Luton so far. The best chance has fallen to Leicester's Marc Albrighton, who stung the palms of Luton goalkeeper James Shea.
Colchester 0-0 Tottenham
Almost a first senior goal for Troy Parrott!
The 17-year-old Tottenham forward drags a shot across goal and it's dangerous but it nicks off Tom Eastman and goes away for a corner, which Colchester clear.
Parrott has been training with the Spurs first-team squad in the early weeks of the season and, with the north London side a little light on back-up to Harry Kane in the central striker's role, a big performance from the Irish teenager could help him force his way into Mauricio Pochettino's Premier League thinking.
Sheffield Wednesday 0-2 Everton
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Just goals in that one game so far in the cup...
Sheffield Wednesday 0-2 Everton
Nearly game over at Hillsborough. Richarlison nods wide from a corner for Everton, who are coasting after those two early goals from Dominic Calvert-Lewin.
Watford 0-0 Swansea
Forgotten man Danny Welbeck is played through on goal for Watford - but his left-footed effort is tame and an easy gather.
Preston 0-0 Man City
A bright start for Preston, who are giving as good as they get. Daniel Johnson whips a fine cross into the box which Claudio Bravo catches under pressure.
Arsenal v Nottingham Forest (20:00 BST)
A bit later than expected, but we're under way at the Emirates now.
Image source, Getty ImagesPreston 0-0 Man City
Emlyn Begley
BBC Sport at Deepdale
A big night for Manchester City's young central defenders - Eric Garcia and Taylor Harwood-Bellis, who are wearing a combined squad number of 128.
With City's injury problems at the back, there are spots up for grabs. Garcia came on against Watford at the weekend.
Portsmouth 0-0 Southampton
Portsmouth having the better of it early on at Fratton Park. John Marquis fizzes a shot just wide from the edge of the area and Saints goalkeeper Alex McCarthy has just had to tip over a goal-bound half volley from Brett Pitman.
Crawley 0-0 Stoke
Crawley, going well in League Two so far this season, go close with the dangerous Reece Grego-Cox shooting into the side-netting from the edge of the box.