Arsenal pound Ighalo’s Watford 3-1
•Leicester, Man United, Everton Celebrate
Watford and Arsenal had one defeat and a draw from the opening two league matches, but The Gunners’ impressive first-half performance earned them three points.
A Santi Cazorla penalty, Alexis Sanchez’s fumbled effort and Mesut Ozil’s header gave the Gunners a 3-0 lead at half-time.
Substitute Roberto Pereyra scored for the Hornets on his debut, but it proved to be a consolation for the hosts.
Jamie Vardy scored his first goal of the season as champions Leicester recorded their first win with victory over Swansea in very wet conditions.
The England striker fired in off the post from Danny Drinkwater’s ball before Wes Morgan volleyed in from a right-wing corner after the break.
Leicester’s Riyad Mahrez had a penalty saved by Lukasz Fabianski, who also blocked Shinji Okazaki’s follow-up.
Swansea pulled one back when Leroy Fer headed in from Modou Barrow’s cross.
Ronald Koeman maintained his unbeaten start as Everton manager as his team defeated a Stoke side that remain without a league win this season.
Everton had efforts from Romelu Lukaku and Ashley Williams cleared off the line before they got a penalty, when Williams was tripped by Phil Bardsley.
Shay Given pushed Leighton Baines’ spot-kick on to the post but the ball then rebounded off Given’s head and in.
Stoke’s Marko Arnautovic hit the crossbar, but Everton held on to win.
Southampton and Sunderland drew to remain in search of their first Premier League wins of the season.
Black Cats striker Jermain Defoe opened the scoring, smashing in a penalty after being brought down by Jose Fonte.
Home striker Charlie Austin forced Jordan Pickford into a low save, while the Sunderland goalkeeper also kept out Shane Long and Nathan Redmond strikes.
But Pickford was at fault for the equaliser, letting Jay Rodriguez’s long-range shot squirm under his body.
Danny Rose’s second-half strike gave Tottenham a point after Liverpool looked on course for a second successive away win in north London.
Liverpool beat Arsenal 4-3 at Emirates Stadium on the opening weekend of the Premier League season, and were in control through James Milner’s penalty, scored just before the break after Erik Lamela fouled Philippe Coutinho.
Tottenham goalkeeper Michel Vorm had earlier saved brilliantly from Coutinho, and Joel Matip had glanced a header off the bar, as Liverpool tried to make the most of their superiority.
Mauricio Pochettino’s side finally roused themselves and after Liverpool keeper Simon Mignolet saved superbly from Toby Alderweireld’s header, Rose arrived at the far post to take Eric Dier’s cross under control and drive in a low finish to earn Spurs a point.