Argentine giants Boca Juniors face Brazilians Fluminense on Saturday in the Copa Libertadores final, a game you can watch live on the BBC in the UK.
The game, which kicks off at 20:00 GMT, will be streamed live on the iPlayer and BBC Sport website.
Fluminense will have home advantage with the game at Rio de Janeiro’s iconic Maracana stadium.
Boca have won the Copa Libertadores, South America’s Champions League, six times but Fluminense have never won it.
What are some things to keep an eye out for in the game?
Boca hope for less eventful final than last time
This is Boca Juniors’ first Copa Libertadores final since 2018 when they faced arch-rivals River Plate over two legs.
River supporters attacked the Boca bus before the second leg, leaving players with cuts from the glass from broken windows and reportedly dizzy and sick from the tear gas used by police to disperse the crowds.
It was eventually played two weeks later more than 6,000 miles away at Real Madrid’s Bernabeu, with River winning 3-1 (5-3 on aggregate) in extra time in front of 72,000 fans.
The Copa Libertadores final became a one-leg affair at a neutral venue after that.
The Maracana is the home of Fluminense, as well as several other Rio clubs, but was announced as the final venue before the group stages began.
Copa Libertadores stats – can Boca equal competition record?
This is Boca Juniors’ 12th Copa Libertadores final – extending their own record.
They have won six times – between 1977 and 2007 – and lost five, including their last two appearances in 2012 and the ill-fated 2018 final.
If they win this one, they would equal city rivals Independiente’s record of seven Copa Libertadores titles. If they lose they would equal Penarol’s record of six final defeats.
They won all three knockout rounds on penalties on their way to Rio this time.
Can Fluminense win it for first time?
Fluminense are hoping to become the 26th team to win the competition – and the first new winners since San Lorenzo in 2014.
The four-time Brazilian champions are arguably the biggest club to have never won the Copa Libertadores.
They came close once before, losing the 2008 final on penalties to LDU Quito after a 5-5 aggregate draw, the only time a team from Ecuador have ever won the cup.
Potential opponents for Manchester City?
The winners of the game will represent South America at the Fifa Club World Cup in Saudi Arabia in December, where they could face Manchester City in the final.
City have qualified for the competition for the first time by winning the Champions League.
The South American and European champions go straight into different semi-finals – and have met in 12 of the past 18 finals.
Some stars on show
Fluminense defender Marcelo is bidding to become the 15th player to win both the Copa Libertadores and the Champions League, which he lifted five times with Real Madrid.
“I don’t think of myself as a renowned player who has lots of titles,” said the 35-year-old, who started his career at Fluminense before moving to Spain.
“I always think about the now, and now I’m enjoying one of the best moments of my life, playing a final with Fluminense. What I did in the past has been and gone. What gives me joy and motivation every day is the moment.”
Two former Manchester United players are likely to start for Boca – goalkeeper Sergio Romero and striker Edinson Cavani. A third, defender Marcos Rojo, is suspended.
At 36, Romero will be the younger of the two goalkeepers. Fluminense’s number one is 43-year-old Fabio, who has never won the Copa Libertadores.
Yet another veteran talking point is Flu’s 35-year-old striker German Cano.
The Argentine has scored 12 goals in 11 appearances in this season’s competition – a record for a player of a foreign team. Nobody had scored more goals in a Copa Libertadores season since 2000.