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Running his first race this season, Jabir clocked 49.94 seconds to finish first in men's 400m hurdles.
Ducati's Francesco Bagnaia suffered a crash that blows the World Championship contest wide open.
Sunday's main race has been shortened due to the conditions at the Buddh International Circuit.
The 20-year-old clocked 4:05.39 seconds to erase the mark set by Sunita Rani at 4:06.03 at the 2002 Asian Games in Busan.