Left-arm spinner R Sai Kishore stole the show with a seven-wicket haul as South Zone seized the all-important lead against North Zone on the third day of the Duleep Trophy semifinal here on Saturday. Meanwhile in Coimbatore, Prithvi Shaw's blistering 142 (140 balls, 15 fours, 4 sixes) helped West Zone set Central Zone a massive target of 501 in the other semifinal.