Against Fritz, he initially followed up on the idea, his second final on the ATP tour after the clay court tournament in Munich in May was approaching.
But Fritz, who last defeated Alexander Zverev (Hamburg) in Indian Wells, improved and won the second duel with Struff after almost two hours.
The German won the first in Wimbledon in 2019.
The best scenes: This is how Sinner won the duel of talents against Ruud
