BUDAPEST (Reuters) - Australia's Olympic champion Mack Horton was forced into an early tussle to qualify for the men's 400 metres freestyle final alongside Chinese rival Sun Yang on the opening morning of swimming's world championships on Sunday.
Horton finished third in his heat to qualify fifth fastest as Austria's Felix Auboeck clocked a personal best three minutes 44.19 seconds to secure a centre lane berth with Sun at the Duna Arena.
