CREATE TABLE table_37816 ("Week of" TEXT, "Tournament" TEXT, "Champions" TEXT, "Runners-up" TEXT, "Semifinalists" TEXT)

Whose Runner-up has a Semifinalist of guillermo p rez-rold n andrea gaudenzi?
SELECT "Runners-up" FROM table_37816 WHERE "Semifinalists" = 'guillermo pérez-roldán andrea gaudenzi'
SELECT "Runners-up" FROM "table_37816" WHERE "Semifinalists" = 'guillermo pérez-roldán andrea gaudenzi'