Uttam Mazumdar is an energetic and enthusiastic coach. “He is my son,” says Mazumdar proudly as Ishan prepares to play in his first World Cup. Ishan drove him the first ball and later smashed two sixes that landed on the roof of the stadium.” Proud mentor: Uttam Mazumdar has overseen Ishan Kishan’s ascent to the Indian team. Ishan’s bat speed …