Benjamin Pavard scored the only goal as Bayern Munich beat Tigres to win the Fifa Club World Cup final in Qatar, their sixth trophy in nine months.
Bayern have won the Uefa Super Cup, German Super Cup and are now world champions, to complete a clean sweep of trophies after last season’s Treble.
Pavard’s goal was initially ruled out for a Robert Lewandowski offside but given after VAR consultation.
Joshua Kimmich had earlier had a goal disallowed by the VAR.
This is the eighth year in a row that a European club has won the Fifa Club World Cup, including Liverpool last season.
Tigres of Mexico were the first team from North or Central America to reach the final but could not end the dominance of European and South American teams in the tournament.
Former France striker Andre-Pierre Gignac failed to add to his three goals in Qatar, although still won the Golden Boot.
Former Bayern Munich boss Pep Guardiola, now the Manchester City manager, recorded a video congratulating his old team.
“Big congratulations to the whole Bayern family for this incredible success. To be the club world champions and to win six out of six titles – I am so proud,” he said.
“I would like to say to Hansi [Bayern boss Flick] you are the second team to win six in a row. Before it was Barcelona [in 2009 under Guardiola]. Maybe I can call Messi and company and we can play for the seventh title. Tell me when and where.”
Qatar was hosting the tournament, which is being viewed a trial run for next year’s World Cup. A limited amount of fans were allowed to watch at the Education City Stadium in Al Rayyan.
The victory cemented Bayern’s status as the outstanding club team of 2020 – the Club World Cup was meant to be in December but delayed because of Covid.