KINGSTON, Jamaica Jamaica made a winning start to the Concacaf Under- 20 World Cup by beating Martinique 1-0 in their Group F game played at the St Kitts Technical Centre on Saturday. Defender Romaine Blake scored the lone goal of the game in the 67th minute as Jamaica joined Grenada at the top of the tables after they beat Bermuda 2-1 in the first game of the double-header. The win sets.