A dour type, he is one of only three horses to win back to back Melbourne Cups in 1974 and 1975. He was also the entry into Australian racing for Dato Tan Chin Nam, now one of Bart's leading owners. Think Big was purchased for $10,000 at the New Zealand Yearling Sales. A dour type, he is one of only three horses to win back to back Melbourne Cups in 1974 and 1975. He was also the entry into Australian racing for Dato Tan Chin Nam, now one of Bart's leading owners. Think Big was purchased for $10,000 at the New Zealand Yearling Sales.