Thiem improved to 9-0 in his home country this year, having also lifted the Kitzbuhel trophy in August without dropping a set.
World number five Thiem is the first player to lift five tour-level trophies in 2019, breaking a five-way tie with Novak Djokovic, Rafael Nadal, Roger Federer and Daniil Medvedev. The Roland Garros runner-up added Vienna to Kitzbuhel, Beijing, Barcelona and Indian Wells.