SELECT partner FROM table_name_74 WHERE outcome = "runner-up" AND surface = "clay" AND opponents = "marco chiudinelli michael lammer"
Siapa mitra dalam permainan yang terjadi di permukaan tanah liat dengan lawan Marco Chiudinelli Michael Lammer dan hasil runner-up?
CREATE TABLE table_name_74 (partner VARCHAR, opponents VARCHAR, outcome VARCHAR, surface VARCHAR)