In a battle of World Champions, Lars Grael and Mauricio Bueno lead Alaln Adler/Arthur Lopes after day 1 of the South American Championships, being sailed out of Iate Clube de Rio de Janeiro.  Third is the youth team of Antoni & Arcelio Moreira followed by Leandro and Lucas Altolaguirre of Argentina with Andre Vita Diomelli and Marcelo Sansone in 5th.  22 boats have registered for the event with racing to continue through Sunday.