Gay, trailing out of the blocks, exploded near the midway point and powered home to win in the fastest time in the world this year.
Justin Gatlin, the 2004 Olympic gold medallist who handed six-time Olympic champion Bolt a rare defeat in Rome this month, just couldn’t match Gay in the closing stages. Running warily with a mild right hamstring strain, Gatlin finished second in 9.89.
Charles Silmon seized the third World Championships berth on offer by the narrowest of margins, finishing third in 9.98sec (9.972) with Michael Rodgers relegated to fourth by just two-thousandths of a second (9.974).
Photos: Salman Khan returns from Jodhpur to Mumbai
Pics: Sidharth Shukla-Rashami Desai's sizzling chemistry at TV show launch
Ooh La Lana! WWE Diva flaunts sexy curves in these 30 pictures
15 'peach' perfect photos of Priyanka Chopra at People's Choice Awards 2017
62 going on 16: These photos of Rekha prove she is 'forever young'