Sunil Manohar Gavaskar — born 10 July 1949 in Bombay, full Test debut 6 March 1971 — was the dominant Test batter of the 1970s and the first half of the 1980s. By 1981 he had been India's senior Test batter for a decade and had accumulated runs at a rate that put him on a clear trajectory toward records no Test batter had previously reached. His 6,000th Test run, achieved during the 1980-81 home season, was the structural milestone that confirmed where the career was headed.
The 6,000-run benchmark, in 1981, sat in elite company. Only a handful of batters in Test history to that point had reached the figure: Don Bradman, Garfield Sobers, Geoff Boycott, Colin Cowdrey, Walter Hammond, Len Hutton. Gavaskar's arrival in that group, at age 31 and with substantial career ahead, marked the moment cricket began to discuss him as a candidate for the absolute Test batting records rather than merely as the leading Indian Test batter of his generation.
He would go on to become, on 7 March 1987 at Ahmedabad, the first batter in Test history to cross 10,000 Test runs. The 10,000 mark is the celebrated milestone; the 6,000 in 1981 was the marker on the path. Gavaskar's final Test totals were 10,122 runs at 51.12 across 125 matches, with 34 Test centuries — a then-record that stood until Sachin Tendulkar surpassed it in 2005.