Thiem told www.atptour.com: “Winning this means a lot to me because it’s such a traditional and special tournament. Only great players have won here.
“Rafa has won it 11 times and it means a lot that [compatriot Thomas] Muster won it twice. It’s a big moment for me.”
Thiem’s victory over the seventh-seeded Russian handed him his 13th ATP Tour title, nine of which have comes on clay.