The line-up for next week's end-of-season ATP World Tour finals in London was completed on Thursday following Milos Raonic's exit from the Paris Masters.
The young Canadian needed to reach the final - at the very least - to stand any chance of forcing his way into the tournament at the O2 Arena.
But Raonic was sent-packing by Tomas Berdych who was already assured of his spot at the Tour finale.
The Czech No 6 seed won 7-6 (15-13) 6-4, with the marathon opening set tie-break playing a pivotal role in the match.
Raonic failed with three-set point attempts - two on his own serve - to then see his opponent clinch the breaker on his fifth opportunity.
A despondent Raonic promptly lost his serve in the opening game of the second set - the only break of the entire contest - with Berdych securing his spot in the quarter-finals on his first and only match point.
The result meant Switzerland's Stanislas Wawrinka and Richard Gasquet of France claimed the final two places for next week's showpiece.
Wawrinka, who will appear in the season-ending event for the first time in his career, made it through to the last eight in the French capital with a comfortable 6-3 6-2 triumph over Spain's Nicolas Almagro.
The seventh seed will next meet Novak Djokovic, who had to recover from a set down to see off the challenge of big-serving American John Isner 6-7 (5/7) 6-1 6-2.
And Wawrinka was delighted with the news he had qualified for the finals, saying: "Going to London is not a normal thing.
"You need to have an exceptional year. This year I had very good results to be able to compete for this.
"What changed this year is that I really tried to enjoy my victories more."
Roger Federer also hailed his compatriot's landmark season: "Physically we know how tough he is.
"I think it was important for him mentally to show the players and the press, I guess, and the critics, that he can hang tough with the best guys and do it on all surfaces."
Gasquet celebrated his qualification with a 6-3 6-2 triumph over Kei Nishikori. The Frenchman will now go up against Rafael Nadal, a 7-5 6-4 winner over Poland's Jerzy Janowicz in the final match on court on Thursday.
Djokovic, Nadal, David Ferrer, Juan Martin del Potro and Berdych had all booked their places in London ahead of playing in Paris, while Federer claimed his spot when he reached the third round in the French capital on Wednesday evening.
British world No 4 Andy Murray had to pull out of the ATP Tour Finals because of lower back surgery.