The 21-year-old Peters defeated 2017 World Champion Johannes Vetter of Germany and Estonia's World leader at 90.61m Magnus Kirt with 4th round throw of 86.89m.
Magnus Kirt took silver medal with 86.21m from round two while defending champion Vetter concluded the podium with 85.37m effort.
Peters also won Pan American Games in Lima in August and NCAA D1 championships in July in Austin, Texas.