ST POLTEN, Austria, May 21 (AFP) - Results from the 425,000 dollar ATP tournament here on Friday (x denotes seed): Semi-finals Marcelo Rios (Chi x2) bt Younes El Aynaoui (Mar x6) 6-1, 6-3 Mariano Zabaleta (Arg x5) bt Yevgeny Kafelnikov (Rus x1) 7-5, 6-3 Quarter-finals Marcelo Rios (Chi x2) bt Stefan Koubek (Aut) 6-4, 6-0 Postponed from Friday because of rain Mariano Zabaleta (Arg x5) bt Francisco Clavet (Spa x4) 6-2, 4-6, 6-3 Yevgeny Kafelnikov (Rus x1) bt Markus Hipfl (Aut) 6-2, 6-2  