ST GEORGE’S, Grenada, Jun 29, CMC – West Indies repeated their batting mistakes from last weekend’s loss with another happy-go-lucky approach, as they slumped to a one-run defeat to South Africa in the third Twenty20 International on Tuesday.Chasing 168 in a near carbon copy of Sunday’s contest at the Grenada National Stadium, West Indies attacked from the outset but were once again guilty of injudicious stroke-play and failure to rotate strike, to end on 166 for seven off their 20 overs.