The Six Invitational 2019 was the Tom Clancy's Rainbow Six Siege championship tournament for the 2018 esports season. The third iteration of the Six Invitational, it took place from February 11th to 17th, 2019. With a $2,000,000 USD prize pool, it was won by G2 Esports. The Road To S.I. 2019 event launched on January 25th and concluded on February 18th, 2019.
The Group Stage was held from February 11th to 14th. The sixteen teams were divided into four groups of four in a double elimination bracket. Teams played best of three matches, with the top two teams of each group qualifying for the playoffs.
The Quarter Finals began on February 15th. A single elimination bracket, each bracket was divided into Quarter, Semi, and Grand Final events. The Quarter Finals took place on February 15th while the Semi Finals took place on February 16th. To progress on the bracket, teams had to win by best of three matches. Behind the scene videos and The Hammer and the Scalpel cinematic short were also released during this time.
The Grand Final was held on February 17th following the reveal of the Year 4 roadmap, Operation Phantom Sight, and an All Star exhibition match. Unlike the Quarter or Semi Finals, the two remaining teams played best of five matches. With 0-3, the championship was won by G2 Esports.