Aoki , the elder brother of reigning 125cc world champion Haruchika , had a race-long duel with John Kocinski of the United States on a Ducati before taking the chequered flag .
<response> <person>Aoki</person> , the elder brother of reigning 125cc world champion <person>Haruchika</person> , had a race-long duel with <person>John Kocinski</person> of the <location>United States</location> on a <organization>Ducati</organization> before taking the chequered flag . </response>