Vastine’s experience told against the 20-year-old German, as he crafted a two-point advantage at the end of the first round and stayed in control with a powerful, accurate display, which will make him  one of the favourites at 69kg.

Also at Welter Weight, there were wins for Mongolia’s Tuvshinbat Byamba, Canadian Custio Clayton and Australia’s world number five Cameron Hammond, who had too much for Nigeria’s Abdoulaye Hima, winning 13-6.

In the Light Weight division, Kazakhstan’s fifth seed and world bronze medallist Gani Zhailauov was lucky to hold on against Thailand’s Saylom Ardee, coming from behind to pull off a victory on countback after a 12-12 draw.

Puerto Rico’s Panamerican youth champion Felix Verdejo Sanchez, age 19, beat Juan Huertas Garcia of Panama 11-5 with a patient display of counter-punching, while Liu Qiang of China had too much for Australian Luke Jackson, coasting to a 20-7 success.