Denis Shapovalov won't play in upcoming NextGen ATP Finals
Shapovalov who qualified for the second year running will be replaced by Polish player Hubert Hurkacz.
The 19-year-old is ranked 29th in the world after an impressive second year on the ATP Tour.
The NextGen Finals features the top eight players aged 21 and under, although Germany's Alexander Zverev will also be missing as he has qualified for the ATP World Tour Finals.
(With inputs from agencies.)