Rios could have regained the world no. 1 from Sampras in November 1998, had he won his home tournament at Santiago. However he lost his quarter-final against the world no. 88 Juan Antonio Marin from Costa Rica.
It was painful seeing Rios choke year after after in Chile and fail to win his home title in 9 attempts. 7 out of his 9 defeats there came against players ranked outside the top 50, and a lot of the players who beat him in Chile never beat him anywhere else.