Sharma (50Kg) won the medal in Sub Junior category of Kumite event while Vatcha claimed podium finish in the Sub Junior of Kata, All India Karate-Do Federation (AIKF) said in a release.
Eight-member Indian Karate team is currently participating in the championships being held from July 1-7.
Meanwhile, AIKF general secretary Shihan Bharat Sharma has become India's first WKF certified Kumite coach by clearing the WKF exam held during the event.