The top two drivers in each group progress to the quarterfinals. Then it's a knockout tournament all the way to the Grand Final, when this year's Champion of Champions will be crowned.
Race Of Champions Draw (Saturday)
Group A
Sebastian Vettel (Germany)
Travis Pastrana (USA)
Helio Castroneves (Brazil)
Either Scott Speed (USA) or Alexander Rossi (USA), to be decided by playoff
Group B
Juan-Pablo Montoya (Colombia)
Petter Solberg (Norway)
Felipe Massa (Brazil)
Pascal Wehrlein (Germany)
Group C
Jenson Button (Great Britain)
Kyle Busch (USA)
Tony Kanaan (Brazil)
James Hinchcliffe (Canada)
Group D
Tom Kristensen (Denmark)
Kurt Busch (USA)
David Coulthard (Great Britain)
Ryan Hunter-Reay (USA)
Sunday's ROC Nations Cup will feature 10 teams split over three groups. There are three home teams in action, all in the same Group A: Team USA NASCAR (Kyle and Kurt Busch), Team USA IndyCar (Alexander Rossi and Ryan Hunter-Reay) and Team USA Rally X (Travis Pastrana and Scott Speed) will all have to battle Team ROC Factor Canada (James Hinchcliffe and Stefan Rzadzinski).
Three European teams meet up in Group B: Team Germany (Sebastian Vettel and Pascal Wehrlein), Team Great Britain (Jenson Button and David Coulthard) and Team Nordic (Tom Kristensen and Petter Solberg).
Finally, Group C is an all-South American affair: Team Brazil (Felipe Massa and Tony Kanaan), Team Colombia (Juan-Pablo Montoya and Gabby Chaves) and Team ROC Factor Latin America (Helio Castroneves and Gabriel Glusman).
The top two teams from Group A will meet in the semifinals, guaranteeing a North American presence in the final. The winners of Groups B and C will meet in the other semifinal. The knockout rounds are best-of-three: if scores are tied at 1-1 after the first two heats, the third decisive heat is always contested by the two winning drivers.
ROC Nations Cup Draw (Sunday)
Group A
Team USA NASCAR (Kurt Busch & Kyle Busch)
Team USA IndyCar (Ryan Hunter-Reay & Alexander Rossi)
Team USA Rally X (Travis Pastrana & Scott Speed)
Team ROC Factor Canada (James Hinchcliffe & Stefan Rzadzinski)
Group B
Team Great Britain (Jenson Button & David Coulthard)
Team Germany (Sebastian Vettel & Pascal Wehrlein)
Team Nordic (Tom Kristensen & Petter Solberg)
Group C
Team ROC Factor Latin America (Helio Castroneves & Gabriel Glusman)
Team Brazil (Tony Kanaan & Felipe Massa)
Team Colombia (Juan Pablo Montoya & Gabby Chaves)
Sunday's action will conclude with a new, Ryder Cup-style points-based event that will make its debut at ROC Miami: America versus The World.
The six U.S. drivers will take on the drivers from the rest of the world in an extreme driving challenge, with individual line-ups decided in advance by the team captains. Competing across a maximum of three rounds and 10 races, the winning team will be the first to amass eight points.
Round A features six races, each of which is worth one point to the winning driver's team. Round B has just three races but with two points for a victory. If needed Round C will feature a final, single race showdown to decide the inaugural champions.