World number eight Dominic Thiem has qualified for the ATP Finals for the third year in a row.
The big-hitting Austrian has won three titles this year and also reached his first Grand Slam final, losing to Rafael Nadal in the French Open in June.
The 25-year-old's opponents in the Lleyton Hewitt group for the round-robin stage are Roger Federer, Kevin Anderson and Kei Nishikori.
He starts his campaign against Anderson on Sunday (not before 14:00 GMT).
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