Ex-India spinner Pragyan Ojha has backed Kuldeep Yadav to be India's game-changer with the pink ball ahead of the Day-Night Test in Australia. "In domestic pink-ball tournaments, he was successful. Batsmen were finding it difficult to pick him. Especially during the twilight period, batsmen were struggling to read him," Ojha said. "That's when he picked up maximum wickets," he added.