Pakistan's Arshad Nadeem finished second and won the silver medal.
Olympic gold medallist best bet for India at marquee event in Budapest.
On a cold Lausanne on Friday night, Chopra, coming back from a muscle strain, had an indifferent begin. His usual MO is to set the tempo and ask the field to play catch up.
Germany’s Julian Weber came second (87.03m) and Jakub Vadlejch finished third (86.13m).
All eyes on Olympic champion as he makes a comeback after groin strain; world's top throwers part of Lausanne event