Kammala wannan jumla: A karo na shida gama a kakar ta biyu tseren a
Brazil ta sanya shi matashi mafi ƙanƙanta a tarihi don zira kwallaye. A cikin tsere shida na farko, ya cancanci sama da abokin aikinsa Ralf Schumacher sau biyu, kuma ya kasance kusa da sauri. Koyaya, Williams sun yi niyyar amfani da Button ne kawai har sai sun sami damar yin amfani da zaɓin su don siyan Juan Pablo Montoya mai daraja sosai daga kwantiraginsa a Chip Ganassi Racing. Ragewar yanayin Button, haɗe tare da nasarar Montoya a Indianapolis 500 na 2000, ya sa aka sanar da Montoya a matsayin wanda zai maye gurbinsa a tsakiyar kakar. Williams ya zaɓi kada ya sayar da kwangilar Button, yana riƙe da haƙƙin da ya kira shi a 2003. Ya tafi Benetton Formula a kan aro na shekaru biyu.