Jamaica's young Reggae Boyz started the inaugural CONCACAF Under-15 Championship with a convincing 4-0 win over Grenada at the Truman Boden stadium in the Cayman Islands on Tuesday. The Fabian Davis coached side was led by Peter Campbell's first half double before Stephan Malcolm in the 63rd and Justin Mcmaster three minutes later killed the game as a contest. The Jamaicans who lead the group on goal difference will next play St. Lucia on Thursday. The St Lucians lost their open match 1-0 to Belize.In group A, hosts Cayman Islands trounced St Marteen 12-0 while Bermuda hammered the Virgin Islands 8-0. The four group winners will advance to the semi-finals of the tournament.