CREATE TABLE table_68121 ("Outcome" TEXT, "Date" TEXT, "Tournament" TEXT, "Surface" TEXT, "Partner" TEXT, "Opponents" TEXT, "Score" TEXT)

Who is the partner with a score of 6 1, 6 4?
SELECT "Partner" FROM table_68121 WHERE "Score" = '6–1, 6–4'
SELECT "Partner" FROM "table_68121" WHERE "Score" = '6–1, 6–4'