Mexico 's Marcos Madrid won his match against Vanuatu 's Yoshua Shing in a shutout .
Serbia 's Aleksandar Karakasevic held off Chris Yan of Australia to win 4 - 2 .
Mexico 's Marcos Madrid won his match against Vanuatu 's Yoshua Shing in a shutout , and Serbia 's Aleksandar Karakasevic held off Chris Yan of Australia to win 4 - 2 .