Yes that was a very bad choke. The pressure of playing in his home country in front of his home fans really got to him.
Unfortunately those kind of chokes were far too common for Rios.
Obviously he was not as talented as Rios, but Massu was also unable to win the title in Chile, losing in the final in 2006 and 2007 (Vina Del Mar is his home city as well I believe). At least Gonzalez won the tournament 4 times.