Elsewhere, champions Chelsea thumped their hosts Stoke City 4-0, thanks to a Morata hat-trick (2′ minutes, 77′ minutes, 82′ minutes) and a finish by Pedro (30′ minutes).
And the fact it came in the week that Diego Costa finally re-signed for Atletico was pretty pertinent.
Morata then struck twice in five minutes late on to add some gloss to a scoreline that reflected harshly on Stoke.
"If he'd have gone off and Chelsea went down to 10 men, that might have been a key moment, but it wasn't to be and in the end the game went away from us".
"Morata played a good game".
"I think the players that arrive have the quality to play here and the squad and the team are still strong".
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The Spain global has scored three Premier League goals since joining the Blues from Real Madrid for a club record £58m in the summer.
A night of good news for Chelsea was headlined by the safe return of Eden Hazard and a hat-trick from young striker Michy Batshuayi.
Morata scored three times with his feet here - the three Chelsea goals he had netted prior to this had all been headers. Having shown a lack of inspiration throughout the team which has seen them gift wins to Everton and Newcastle on the road, they have risen to the title of valiant underdogs in taking four points at home from Arsenal and Manchester United. Morata slotted in his opener after the hosts' makeshift defence - featuring two full-backs playing in central positions in Glen Johnson and Erik Pieters - was slow to react to a long ball forward.
His predatory instincts were on display when completed his hat-trick by finishing off a handsome team move in which Azpilicueta set Morata up for the fourth time this season by chesting the ball into his fellow Spaniard's path, thus leaving the No.9 with a tap-in.
Many thought Chelsea might struggle to replace the Spaniard after his fall-out with manager Antonio Conte. Even Wimmer is touch and go with a hamstring injury. Substitutes: Peter Crouch (for Jese, 61) 6, Ibrahim Afellay (for Martins Indi, 76) 5.
Thibaut Courtois of Chelsea makes a save during the Premier League match between Chelsea and Arsenal at Stamford Bridge on September 17, 2017 in London, England.