The Premier League had goalkeeping howlers, touchline hugs and some brilliant football from a player who looked to be on his way out this summer.
Here are some of the most important highlights of the day's action.
Man Utd 1-2 Man City
Arsenal 2-1 Southampton
Bournemouth 1-0 West Brom
Burnley 1-1 Hull
Middlesbrough 1-2 Crystal Palace
Stoke 0-4 Tottenham
West Ham 2-4 Watford
Capitulation of the day
West Ham looked like cruising to victory against Watford at their new stadium, going 2-0 up by the 33rd minute. Pretty soon though things started to go downhill. By the 63rd minute Watford had scored four goals and the game ended as a 4-2 hammering against the home side.
West Ham holding onto their 2-0 lead like... pic.twitter.com/YEcMKRnAA2
-- Bleacher Report UK (@br_uk) September 10, 2016
Controversy of the day
Arsenal looked set to be heading for a draw at home to a brilliantly organised Southampton. Laurent Koscielny celebrated his 31st birthday with a goal to make it 1-1 at half-time, cancelling out a Petr Cech own goal which had given the Saints the lead.
I'm going to do the only thing I know that will ensure a goal. I'm going to start writing the intro for Arsenal's 1-1 draw with Southampton.
-- Iain Macintosh (@iainmacintosh) September 10, 2016
Unfortunately for Southampton's manager Claude Puel, controversy would keep him from earning his first win with his new team. Referee Robert Madley judged Jose Fonte to have fouled Gunners striker Olivier Giroud in the box and Santi Cazorla slotted in the ensuing penalty in the 94th minute.
Hug of the day
The Manchester derby didn't disappoint. It had controversy, a shocker of a debut (which you will hear more about all too soon) and even what looked like a hug between Wayne Rooney and Pep Guardiola. Or maybe it was a dance?
In fairness, he was trying to get the ball for a throw-in, but some had other ideas of what was going on...
Pep was just asking Rooney where he got the hair implants from
-- Football Funnys (@FootballFunnys) September 10, 2016
Shocker of the day
Talking of the Manchester derby, perhaps the player who attracted the most Twitter attention was City's new keeper Claudio Bravo.
Sadly it is not for reasons he will have hoped though, as poor keeping led to a goal from Zlatan Ibrahimovic and he could have conceded a penalty after he appeared to foul Rooney.
Great debut for Claudio Bravo today. Tried really hard but unfortunately couldn't win it for Manchester United.
-- Samir Bhatia (@SamirBhatia8) September 10, 2016
SUMMARY: Cladio Bravo's performance in The Manchester Derby.
-- BBC Sporf (@BBCSporf) September 10, 2016
Dental mishap of the day
Yes, you read that headline correctly. Another story about the derby here, as City's Aleksander Kolarov really put his body on the line for his team - he lost a tooth after a challenge with United's Marouane Fellaini.
-- footbilly (@footbilly) September 10, 2016
He looks pretty happy about the whole thing and he should, given the performance of his team. A dentist will surely fix up his gappy-gob in no time anyway and in the meantime he could be running into some money...
Kolarov looks well chuffed that he lost his tooth. Wonder if the Tooth Fairy will give him 50p or £1.
-- Claire (@_Froglet) September 10, 2016
Team of the day
-- Jan Vertonghen (@JanVertonghen) September 10, 2016
Tottenham really turned up, dominating Stoke away from home. Even Harry Kane scored, his first of the season after a summer he would rather forget.
Mark Hughes' Stoke had a torrid time at the back and need a lift to kick-start their season. However, four goals and a clean sheet at a ground famously difficult to visit is hard to argue with, so Spurs are team of the day.
-- Spurred On (@spurredontv) September 10, 2016
Player of the day
In their four-nil demolition job, Spurs swept aside their opponents Stoke, and Son Heung-min was their star.
There was talk of Son leaving in the summer, but manager Mauricio Pochettino will be happy the South Korean stayed. Although Stoke are clearly having troubles at the back, sitting bottom of the Premier League with one point, Son was outstanding, scoring two goals, the second of which was a spectacular curling effort.
?Here comes the Son to play for Tottenham, Here comes the Son to play at White Hart La-La-La-La-La-La-La-La?
-- The Bricklayers (@BricklayersN17) September 10, 2016
In fairness, Manchester City's Kevin De Bruyne was brilliant, scoring a goal and hitting the post twice in the win away to his former manager Jose Mourinho's team. However, we think you've heard quite enough about the Manchester derby.