Table: tennis_tournaments
Columns: week_of
tournament
champion
runner_up
semifinalists
quarterfinalists

Question: How many champions are shown for the runner-up of stefan edberg?
SQL: SELECT COUNT("champion") FROM tennis_tournaments 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 tennis_tournaments 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 tennis_tournaments 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 tennis_tournaments WHERE "runner_up" = 'Mike De Palmer Gary Donnelly'

Question: Who are the quarterfinalists for runner-up  jimmy connors?
SQL: SELECT "quarterfinalists" FROM tennis_tournaments 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 tennis_tournaments WHERE "champion" = 'John McEnroe 6–2, 6–3'