CREATE TABLE table_44450 ("Outcome" TEXT, "Date" TEXT, "Surface" TEXT, "Partner" TEXT, "Opponents" TEXT, "Score" TEXT)

Who was the partner on the game which took place on a clay surface with opponents of marco chiudinelli michael lammer and a runner-up result?
SELECT "Partner" FROM table_44450 WHERE "Outcome" = 'runner-up' AND "Surface" = 'clay' AND "Opponents" = 'marco chiudinelli michael lammer'
SELECT "Partner" FROM "table_44450" WHERE "Opponents" = 'marco chiudinelli michael lammer' AND "Outcome" = 'runner-up' AND "Surface" = 'clay'