Liverpool have taken an early stranglehold on the Premier League after a 100 per cent start to the season with reigning champions Manchester City having suffered an uncharacteristic wobble.

Frank Lampard's fledgling reign as Chelsea boss has taken a turn for the better, while promoted Norwich are gradually getting to grips with life in the top flight having secured a famous win.

Here, the PA news agency takes a look at what we learned from the latest round of fixtures.

No defence

City are going to have to find a solution to their problems at the back if they are to retain their title. Norwich turned in a fine performance to secure an unlikely 3-2 victory at Carrow Road, but they were aided and abetted by some shambolic defending from the visitors, who will be without the injured Aymeric Laporte until the new year. Kenny McLean and Todd Cantwell took full advantage to give the home side a 2-0 lead, but Teemu Pukki's third was a study in incompetence as Nicolas Otamendi and John Stones combined to present him with a simple chance.

Good day for Buendia

Emiliano Buendia is living proof that there are bargains out there in an increasingly expensive transfer market. The 22-year-old Argentinian, who cost Norwich around £1.5million when they signed him from Getafe last summer, played a key role in their promotion campaign and starred in their win over Manchester City, repeatedly breaking up play and charting a way through Pep Guardiola's press to set his team on their way.

Tammy's time

Sheffield United have more than made a fist of life in the big time, but they discovered this weekend that when your luck is out, it is out. They thought they had taken the lead against Southampton when Oli McBurnie turned home Oliver Norwood's free-kick only for his effort to be correctly ruled out for offside, and then had strong penalty appeals waved away before striker Billy Sharp was sent off for a challenge which might have warranted only a yellow card as they went down 1-0.