CREATE TABLE table_51826 ("Outcome" TEXT, "Date" FLOAT, "Championship" TEXT, "Surface" TEXT, "Opponent in the final" TEXT, "Score in the final" TEXT)

What was the championship that had final score of 6 2, 5 7, 6 4, 6 2 and was on a clay surface?
SELECT "Championship" FROM table_51826 WHERE "Surface" = 'clay' AND "Score in the final" = '6–2, 5–7, 6–4, 6–2'
SELECT "Championship" FROM "table_51826" WHERE "Score in the final" = '6–2, 5–7, 6–4, 6–2' AND "Surface" = 'clay'