Jannik Sinner claimed his first title as world number one with victory over Hubert Hurkacz at the Halle Open.
Italy's Sinner won his first Grand Slam at the Australian Open in January and replaced Novak Djokovic at the top of the world rankings earlier in June.
He secured his first grass-court title with a 7-6 (10-8) 7-6 (7-2) victory against Poland's Hurkacz, who he also played doubles with in Germany.
Sinner has lost just three matches this season, falling twice to Carlos Alcaraz at the French Open and Indian Wells, and a loss to Stefanos Tsitsipas in Monte Carlo.