CREATE TABLE table_51816 ("Tournament" TEXT, "1968" TEXT, "1969" TEXT, "1970" TEXT, "1971" TEXT, "1972" TEXT, "1973" TEXT, "1974" TEXT, "1975" TEXT, "1976" TEXT, "1977" TEXT, "1978" TEXT, "1979" TEXT, "Career SR" TEXT, "Career W\\u2013L" TEXT, "Career Win %" TEXT)

What tournament is listed as A in 1972 and 2R in 1975?
SELECT "Tournament" FROM table_51816 WHERE "1972" = 'a' AND "1975" = '2r'
SELECT "Tournament" FROM "table_51816" WHERE "1972" = 'a' AND "1975" = '2r'