Question: How many champions are shown for the runner-up of Stefan Edberg?
SQL: SELECT COUNT("Champion") FROM "1-21584646-10" WHERE "Runner-up" = 'Stefan Edberg';

Question: What week was Stefan Edberg Anders Järryd was semifinalist and champion is John McEnroe 7–6, 6–3?
SQL: SELECT "Week of" FROM "1-21584646-10" WHERE "Semifinalists" = 'Stefan Edberg Anders Järryd' AND "Champion" = 'John McEnroe 7–6, 6–3';

Question: Who is the runner up for the champion of John McEnroe 6–2, 6–3?
SQL: SELECT "Runner-up" FROM "1-21584646-10" WHERE "Champion" = 'John McEnroe 6–2, 6–3';

Question: Who were the  quarterfinalists for the runner-ups of Mike De Palmer Gary Donnelly?
SQL: SELECT "Quarterfinalists" FROM "1-21584646-10" WHERE "Runner-up" = 'Mike De Palmer Gary Donnelly';

Question: Who are the quarterfinalists for runner-up  Jimmy Connors?
SQL: SELECT "Quarterfinalists" FROM "1-21584646-10" WHERE "Runner-up" = 'Jimmy Connors';

Question: How many weeks are shown for the champion of John McEnroe 6–2, 6–3?
SQL: SELECT COUNT("Week of") FROM "1-21584646-10" WHERE "Champion" = 'John McEnroe 6–2, 6–3';