Eden Hazard scored a hat-trick as Chelsea swept aside Cardiff City to maintain their 100% start to the Premier League season and go top of the table.

The newly promoted visitors took the lead when Joe Ralls' free-kick was headed by captain Sean Morrison into the path of Sol Bamba, who volleyed home.

However, Hazard scored twice in seven minutes before half-time to send Chelsea in on top.

The Belgium international scored his third with a late penalty after Bamba brought down Willian, who added the Blues' fourth from long range.

• Relive Chelsea's win against Cardiff City

Victory means Chelsea have started a Premier League season with five successive wins for the fourth time, and first since 2010.

For Cardiff, defeat extends their winless run to six games, their worst spell since Neil Warnock was appointed manager in October 2016.

They started well at Stamford Bridge, and deserved the lead given to them by Bamba, but Chelsea's quality ultimately shone through.

The Blues now have five points more than they had at this stage last season.

Hazard shows his class

Chelsea came into the game in much the better form, but it was Cardiff who dominated the early stages - much to the hosts' frustration.

But, after Bamba's opener, Hazard changed the game with a low 37th-minute strike and doubled his tally with a heavily deflected shot after Olivier Giroud did well to lay the ball to his team-mate.

The Belgian wrapped up his hat-trick late on to seal victory for a Chelsea side who rarely looked in danger of conceding in the second half.

After goals against Newcastle and Bournemouth, as well as against Scotland during the international break, Hazard has scored six goals in his past four games.

He had appeared to be on the verge of leaving Chelsea in the summer after six years with the club, but new boss Maurizio Sarri is getting the best out of him.

And his performance meant Chelsea did not need to rely on a late goal - as they had against Arsenal, Newcastle and Bournemouth.

Bluebirds' winless run continues

While Chelsea look down on the rest, Cardiff will be frustrated the scoreline at Stamford Bridge did not reflect what was a spirited performance.

Their poor run represents a change in form for a side promoted last season against the odds - and a new challenge for Warnock in the Welsh capital.

Having proved the doubters wrong last season, Cardiff have gone into this campaign with much of the side remaining the same - and there has been little to suggest they can get upward momentum.

The Bluebirds have scored just three goals from their opening five games, and Bobby Reid - signed from Bristol City in the summer - only once looked a threat to the Chelsea backline before he was substituted.

There is no doubt Warnock has transformed the club, but Cardiff need a Premier League win - and soon.

Man of the match - Eden Hazard (Chelsea)

A fine start for Chelsea - the stats

• Chelsea have won their opening five games of a Premier League season for the fourth time - after 2005-06, 2009-10 and 2010-11 - more than any other team.
• This is the first time since 1921-22 that Cardiff have opened an English top-flight season without winning any of their first five games.
• Warnock has gone 11 Premier League games without a win as manager for the first time (W0 D5 L6).
• Cardiff are winless in seven matches in all competitions (W0 D3 L4), their worst run under Warnock; they last went on a longer run without victory between January and February 2015 (eight games).
• Since his Premier League debut in August 2012, Hazard (115) has been directly involved in more goals than any other midfielder in the competition (74 goals, 41 assists).
• Hazard is the fourth player to score more than one Premier League hat-trick for Chelsea (also Didier Drogba, Frank Lampard and Jimmy Floyd Hasselbaink).
• Bamba became the oldest player to score his first Premier League goal (33y 244d) since Zlatan Ibrahimovic in August 2016 (34y 316d).
• Giroud provided two assists in a single Premier League game for the third time in his career and first since January 2017 against Bournemouth.

What's next?

Chelsea's Europa League campaign begins on Thursday as they travel to Greece to face PAOK Salonika (17:55 BST). They then play West Ham away in the Premier League on 23 September (13:30 BST).

Cardiff's next game is at home against reigning champions Manchester City on 22 September (15:00 BST).