ST. POLTEN, Austria, May 21 (UPI) -- For the second time in 13 days, Chile's Marcelo Rios will meet Argentina's Mariano Zabaleta in the final of a claycourt tournament. Rios, the second seed and defending champion, and Zabaleta, seeded fifth, each had to win two matches Friday in the rain-plagued International Raiffeisen Grand Prix to set up their championship meeting on Saturday. In the semifinals, Rios clubbed sixth-seeded Moroccan Younes El Aynaoui, 6-1, 6-3, while Zabaleta knocked off top seed and world No. 1 Yevgeny Kafelnikov of Russia, 7-5, 6-3. Earlier, Rios completed a 6-4, 6-0 rout of Austrian wild card Stefan Koubek, while Zabaleta claimed a 6-2, 4-6, 6-3 victory over fourth- seeded Spaniard Francisco Clavet. The 23-year-old Rios, a two-time winner of this event, held a 5-3 lead in the first set before the rains came on Thursday to suspend his match and postpone the Zabaleta-Clavet affair. Kafelnikov blasted Austrian qualifier Markus Hipfl, 6-2, 6-2, earlier in the day in a match postponed by Thursday's rain. In one of the year's most entertaining matches, Rios scored a 6-7 (5- 7), 7-5, 5-7, 7-6 (7-5), 6-2 victory over Zabaleta to win the German Open and $361,000 on May 9. That was a Super 9 event, meaning the final was best of five sets. Saturday's final here, which is worth $57,000, is the standard best-of-three.  