Amarnath made his first-class debut in October 1971 at the age of 15, playing for
Vazir Sultan Tobacco XI in the
Moin-ud-Dowlah Gold Cup Tournament. His Ranji Trophy debut came only five years later for Punjab in the
1976–77 Ranji Trophy. He switched to Haryana before
1978–79 Ranji Trophy and played most of his cricket for the team. He also made single season appearances for Delhi and Vidarbha in 1981/82 and 1983/84 respectively. He finished his career with 36 first-class and one
List A appearances. Amarnath became a cricket commentator after his playing career. He worked as a commentator for several years for
All India Radio and
Doordarshan. Also a coach and author, Amarnath authored a book on his father
Lala Amarnath: Life And Times—The Making Of A Legend. ==Personal life and family==