Former India coach Ravi Shastri called Wednesday for a two-tier structure in Test cricket with relegation and promotion to ensure the survival of the red-ball game. His comments follow the blockbuster fourth Test between India and Australia that drew a record 373,691 spectators to the Melbourne Cricket Ground over five enthralling days. That beat the previous record of 350,534 at the same ground during the 1936-37 Ashes series against England, when Donald Bradman ru