That final never happened, however, as Monaco withdrew beforehand after spraining his ankle in the doubles final.
Despite that, top-seeded Gonzalez improved to 3-0 against fifth-seeded Monaco without conceding a set. He will meet unseeded Pablo Cuevas of Uruguay to try and reach his hometown final for the fifth time.
Second-seeded Tommy Robredo of Spain will face fourth-seeded Jose Acasuso of Argentina in the other semifinal.
Gonzalez broke Argentina's Monaco five times without offering a break chance in return in their 56-minute match.
The Chilean star upped his record in the Movistar to 26-5 with titles in 2002, '04 and '08, and a runner-up finish in '03.
Robredo overcame Argentine wild card Juan Ignacio Chela 0-6, 6-3, 6-4, making the decisive break at 3-3 in the last set to reach his first semifinals since he won his seventh ATP title last July at Bastad, Sweden.
He had a 3-2 record against Acasuso.
Acasuso, the 2006 champion, won 6-4, 6-2 against countryman Sebastian Decoud, a lucky loser who reached his first tour quarterfinals.
Acasuso was playing in his first event of the year after missing last month with a right shoulder injury.
Cuevas made it to the last four for the second straight year by beating local wild card Paul Capdeville 7-5, 7-5.
"I'm really happy to reach the semifinals after playing two very difficult matches to qualify and two more difficult matches in the tournament,'' Cuevas said.
Oliveira’s Debut Goal Helps Real Betis Beat Ten Man Sevilla
Defending champ Gonzalez powers into Chile semis
