CREATE TABLE table_31102 ("Week of" TEXT, "Tournament" TEXT, "Champion" TEXT, "Runner-up" TEXT, "Semifinalists" TEXT, "Quarterfinalists" TEXT)

Who were the semifinalists when the runner-up was Peter Feigl?
SELECT "Semifinalists" FROM table_31102 WHERE "Runner-up" = 'Peter Feigl'
SELECT "Semifinalists" FROM "table_31102" WHERE "Runner-up" = 'Peter Feigl'