Roberto Firmino's extra-time goal saw Liverpool lift the Club World Cup trophy after a hard-fought win over Flamengo in a feisty final.

The two teams could not be separated in the first half of the in Doha, with no shots on goal being recorded by either side in what was at times a bad-tempered encounter.

The Reds, as they did in the first half, came firing out the blocks in the second period and Firmino was unfortunate to see an early effort hit the post.

The clash went to extra time as Sadio Mane was denied a penalty right at the death, with the referee controversially overturning his decision after a lengthy VAR delay.

But Liverpool finally got the goal they deserved when Firmino fired home in the first half of extra time - and the Reds held on to clinch another piece of silverware this season.

Here's six talking points from the clash...

1. Firmino finally delivers for wasteful Reds...

Liverpool's Roberto Firmino celebrates scoring his side's first goal

Roberto Firmino appeared to be having an off-day for Liverpool, wasting several chances, but the Brazilian maestro delivered when Jurgen Klopp needed him most.

The Brazil superstar had two glorious chances to break the deadlock but was wasteful in both halves, with the first chance - after just 40 seconds on the clock - seeing the Brazilian blaze well over the bar.

The second was trademark stuff from the Anfield hero, showing superb feet to create a shooting chance, but the forward fired his shot onto the post and Flamengo were fortunate to clear the danger.

But then in extra time, Mane played in Firmino after a superb counter attack and the Brazilian showed delicate feet to bamboozle the Flamengo defenders before firing home.

2. Think VAR is bad in the Premier League?

Flamengo's players argue with the referee during the 2019 FIFA Club World Cup Final

Premier League referees have caused plenty of controversy with their VAR decisions this season.

And the technology caused yet more fury, this time in Doha, when the Reds were denied a penalty in stoppage time.

Match official Abdulrahman Al Jassim pointed to the spot after Mane was deliberately fouled by Rafinha when clear through on goal.

VAR had a long look, seemingly to confirm whether the foul was inside or outside of the box, with replays appearing to show the foul taking place on the edge of the box.

So, surely Liverpool would get a free-kick? Nope. The referee decided that it wasn't a foul and Flamengo were given a drop ball instead. Farce.

3. Heartbreak for Oxlade-Chamberlain...

Liverpool star Alex Oxlade-Chamberlain receives treatment on the field

Alex Oxlade-Chamberlain is finally enjoying a run in the Liverpool first-team after a lengthy spell on the sidelines with knee injury that kept him out for the majority of the last campaign.

And the former Arsenal star was one of the standout performers for a below-par Reds, linking up well with his fellow Reds throughout the game.

But the England playmaker suffered heartbreak in Doha when he landed awkwardly on the turf after jumping for the ball.

Oxlade-Chamberlain was in visible distress on the floor and slapped the ground in frustration before being replaced.

He now faces an anxious wait to discover the extent of the injury.

4. Blistering start from Liverpool...

Roberto Firmino misses a glorious chance to open the scoring

Liverpool were seemingly intent on putting Flamengo under immediate pressure - and they came firing out of the blocks in the first half.

With less than five minutes played, Klopp's men had two glorious chances to open the scoring but Firmino and Naby Keita both blazed their shots over the bar.

Firmino had arguably the better of the two chances but the Brazilian failed to hit the target with just Diego Alves in the Flamengo goal to beat.

The Reds continued to pile the pressure on in the early exchanges, with Trent Alexander-Arnold firing wide from distance, before Flamengo grew into the game.

5. Alexander-Arnold given a lesson...

Liverpool's Trent Alexander-Arnold in action with Flamengo's Bruno Henrique

The Liverpool defender is widely regarded as one of the best right-backs in European football right now - and rightly so.

But the England star was given a torrid time by Flamengo wing wizard Bruno Henrique Pinto in the first half.

Like Alexander-Arnold, Henrique boasts electrifying pace and he had the beating of the young Reds starlet almost every time the pair went toe-to-toe in the opening period.

Indeed, Flamengo's star - who had a spell in Europe with German giants Wolfsburg in 2016/17 - was the standout performer for the Brazilians.

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6. Naughty tactics from Flamengo...

Liverpool's Sadio Mane in action with Flamengo's Rafinha

The Brazilian giants had a host of familiar names in the line-up including former Bayern Munich defender Rafinha, ex-Chelsea star Filipe Luis and Gabriel Barbosa, who is on loan from Inter Milan.

And, while Liverpool's squad undoubtedly boasts plenty of experience, Flamengo's stars also used all their years in European football to their advantage.

Rafinha, in particular, proved a frustrating opponent for Liverpool.

First he got Mane booked, despite initially fouling the Reds star, and he then delayed the second-half on numerous occasions when Klopp's men began to pile the pressure on.

Then Filipe Luis followed suit, going down under what appeared to be a weak challenge. And, after receiving medical treatment, he made a miraculous recovery to return to the action.