South Africa defeated the West Indies by 158 runs after lunch on the fourth day of the second Test of the two-match series at the Daren Sammy Cricket Ground in St Lucia on Monday. The victory means the South Africans, for whom Keshav Maharaj took 5-36 including a hat-trick, take the series 2-0. Scores: South Africa 298 and 174; West Indies 149 and 165 str/lp/gj