CREATE TABLE table_37119 ("Date" TEXT, "Opponent" TEXT, "Score" TEXT, "Loss" TEXT, "Save" TEXT)

Who's the opponent when Diegomar Markwell is the loss?
SELECT "Opponent" FROM table_37119 WHERE "Loss" = 'diegomar markwell'
SELECT "Opponent" FROM "table_37119" WHERE "Loss" = 'diegomar markwell'