CREATE TABLE table_50526 ("Tournament" TEXT, "Surface" TEXT, "Week" TEXT, "Winner" TEXT, "Finalist" TEXT, "Semifinalists" TEXT)

Who was the semifinalist at the tournament in miami?
SELECT "Semifinalists" FROM table_50526 WHERE "Tournament" = 'miami'
SELECT "Semifinalists" FROM "table_50526" WHERE "Tournament" = 'miami'