Roberto Firmino ended a host of questions about his goalscoring ability when he bagged a brace for Brazil on Friday night.

The Liverpool striker scored his side's second and third goals in a comfortable 5-0 World Cup qualifying campaign win against Bolivia.

It takes his scoring record for his country up to 15 goals in 45 appearances.

Questions have been asked about Firmino's ability in front of goal after a difficult start to the campaign with Liverpool in the Premier League.

But his alternative role for Brazil allowed him to take centre stage.

Firmino turns home Brazil's third goal of the game against Bolivia

For Liverpool, Firmino often finds himself as a hybrid, unorthodox midfielder, being more intricately involved in the Reds' build-up play.

The approach has worked a treat for Liverpool in recent years, often leaving the goalscoring finesse to Moahamed Salah and Sadio Mane.

However, Brazil boss Tite wanted to take a completely different approach with him - and deployed him as a traditional No.9.

As a result, Firmino bagged two goals that would be traditionally known as poacher's finishes.

Firmino celebrates one of his goals against Bolivia
A slight change of role for Firmino appeared to get the best out of him

And it perhaps proves that Firmino's struggles in front of goal are not because of his inability in front of the net - but perhaps more so because of the system that he is playing in.

Brazil's captain put their impressive 5-0 win over Bolivia down to the single-minded way the five-times world champions addressed the game in Sao Paulo.

"Without a doubt, we have to highlight the fact that we took this seriously," Casemiro said.

"At no time did we try any funny stuff, we were always respectful. That's football, if you have the opportunity, then try and score more. We took this game 100 % seriously."

Brazil overran Bolivia and could have scored more but for profligate finishing and decent goalkeeping.

Brazil players celebrate during their dominant victory over Bolivia

Everton and Marquinhos both missed golden opportunities during the first three minutes but Marquinhos eventually broke the deadlock with a header after 16 minutes.

Firmino then added goals either side of half time before an own goal from Jose Maria Carrasco and a fifth from Philippe Coutinho completed what was the perfect start for the home side.

The result takes Brazil to the top of the South American qualifying group after just one game, ahead of Colombia, who beat Venezuela 3-0.