Miljan Zekic celebrated his first win on the ATP Tour at the Generali Open on Monday thanks to a straight-sets victory over Andrey Kuznetsov.
The Serbian world number 316 overcame the 250-place ranking gap to beat his Russian opponent 7-6 (7-4) 7-6 (8-6).
Victory over Kuznetsov sees the 29-year-old head into a second-round clash with second seed Fabio Fognini, while top seed Pablo Cuevas takes on wildcard Sebastian Ofner.
Ofner was a set and double break up against Nikoloz Basilishvili in Kitzbuhel when the Georgian retired from the contest, while Joao Sousa got the better of Mikhail Youzhny in three sets.
There were also wins for Dusan Lajovic and Thomaz Bellucci on Monday.