American Allyson Felix cruised to her third straight women’s 200 meters gold medal at the World Athletics Championships in Berlin — but compatriot Jeremy Wariner failed to secure his own hat-trick in the men’s 400m. Felix clocked a time of 20.02 seconds in the Olympic Stadium to beat Olympic champion Veronica Campbell-Brown of Jamaica into second, with Debbie Ferguson-McKenzie of the Bahamas in bronze. “It is very special for me to win here in Berlin,” Felix, 23, told reporters.