De Grandhomme was the star performer for New Zealand against South Africa in World Cup 2019 match. © Twitter New Zealand skipper Kane Williamson, terming Colin de Grandhomme as New Zealand’s x-factor, said that the all-rounder was the standout performer for the the team in its four-wicket win over South Africa on Wednesday. Kane Williamson played the captain’s knock to guide his team to the victory in a tense World Cup encounter. Williamson remained not out at 106 and made sure the New Zealand chase down 242-run target on Wednesday without much hiccups. His innings was decorated with nine fours and a six as New Zealand saw off stiff resistance from South Africa to win with three balls to spare.De Grandhomme was the star performer for New Zealand as he supported Williamson with a gutsy 47-ball 60 that was studded with five fours and two sixes.Apart from sharing a match-winning 91-run stand for the sixth-wicket with Williamson, de Grandhomme also proved his mettle with the ball as he returned with highly economical figures of 1/33 in his 10 overs. He picked up the wicket of Aiden Markaram (38) as New Zealand restricted South Africa for 241/6 in their allotted 49…