Gordon's storming second 200 metres enabled him to mow down the fast-starting Tinsley right on the line, forcing the American to settle for silver again after his second place at last year's Olympics.
Gordon, the world junior champion in 2010, clocked a season-leading 47.69 with Tinsley (47.70) followed home by Serbia's Emir Bekric, who set a national record in 48.05.
Ato Boldon, who won the 200 metres crown in 1997, was Trinidad's last world gold medallist.
(Reporting by Justin Palmer; Editing by Sonia Oxley)
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