CREATE TABLE "singles_performance_timeline" (
  "tournament" text,
  "1972" text,
  "1973" text,
  "1974" text,
  "1975" text,
  "1976" text,
  "1977" text,
  "1978" text
);

Question: What is the 1977 value that had Grand Slam Tournaments in 1972?
SQL: SELECT "1977" FROM "singles_performance_timeline" WHERE "1972"='grand slam tournaments';

Question: What is the tournament that had Grand Slam Tournaments in 1976?
SQL: SELECT "tournament" FROM "singles_performance_timeline" WHERE "1976"='grand slam tournaments';

Question: What is the 1976 value of the Australian Open?
SQL: SELECT "1976" FROM "singles_performance_timeline" WHERE "tournament"='australian open';

Question: What is the 1977 value that has a 1974 a value?
SQL: SELECT "1977" FROM "singles_performance_timeline" WHERE "1974"='a';