Croatia's Marin Cilic won a tense encounter with Belgian David Goffin at the Paris Masters to qualify for ATP World Tour Finals.
Cilic needed six match points before finally seeing off Goffin 6-3 7-6 (11-9) to reach the last eight in Paris.
The 2014 US Open champion joins Novak Djokovic, Andy Murray, Stan Wawrinka, Milos Raonic, Kei Nishikori and Gael Monfils in the line-up for London.
Dominic Thiem, Tomas Berdych or Jo-Wilfried Tsonga will also qualify.
Cilic, 28, will play Djokovic or 14th seed Grigor Dimitrov in the quarter-finals in Paris, with Djokovic needing to reach the final to ensure he keeps hold of the number one ranking.