Dominic Thiem has become the fourth man to qualify for next month's eight-strong ATP Finals.
The Austrian followed fellow Next Gen player Alexander Zverev, who clinched a place last week.
The young pair will join Roger Federer and Rafael Nadal in the field at the O2 Arena. With three weeks remaining in the regular season, four spots are still open.
Thiem's qualification may come as a boost for the 24-year-old, who has done poorly during the autumn Asia swing, with back-to-back opening-round defeats in Tokyo and Shanghai.
The London finals will be played from November 12-19.
"I'm very proud to have qualified again this year," Thiem said. "It's not easy to qualify once but even more so to repeat the following year. I look forward to competing with the best players in the world at The O2."
Thiem is the first Austrian singles player to qualify for multiple season finales since former No.1 Thomas Muster competed in the 1990 and 1995-1997 events.
A year ago, Thiem finished 1-2 in group play at the first year-end tournament of his career.
The Austrian reached the French Open semi-finals for a second consecutive year and won his only silverware of the season in Rio de Janeiro.
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