Karlobag.eu / illustration Sports Jun 9, 2026 · Sports desk Onclin beats Marozsan in Stuttgart after key tie-break for first BOSS OPEN main-draw win Gauthier Onclin defeated Fabian Marozsan 7-6, 6-3 in the first round of the ATP BOSS OPEN in Stuttgart. The Belgian qualifier took control with a decisive first-set tie-break, stayed composed on grass and converted the biggest points against the higher-ranked Hungarian player