Austrian Dominic Thiem won the ATP event in Stuttgart on Monday after rain caused the grasscourt finals against German Philipp Kohlschreiber to be held over.
Kohlschreiber had been leading Thiem 3-2 in a first-set tiebreaker on Sunday when play was halted for the day.
But the Austrian world number seven upped his game Monday, eventually running out a 6-7 (2/7), 6-4, 6-4 winner.
Thiem, who moved into the ATP top 10 last week after a French Open semi-final performance, had already claimed three titles in 2016 — winning Buenos Aires, Acapulco and Nice.
The 22-year-old, who saved two match points as he knocked out Roger Federer in the semi-finals, was successful in his bid to become the first man this season to claim trophies on three different surfaces (clay, hardcourt and now grass).