[AMERICANS ABROAD/VIDEO] Santos' 21-year-old Edgar Castillo was credited for playing a key role in stifling Necaxa's attacks and came close to scoring during a 1-1 tie in the second leg of the quarterfinals that sent Santos through to the Mexican league semifinals, 3-2, on aggregate. MLS veteran Daniel Hernandez was one of four Chiapas players red-carded in stoppage time of its 2-1 loss to Cruz Azul, which advanced because of a better regular-season record after the quarterfinal series ended tied, 2-2, on aggregate.

Hernandez was red-carded for taking swings at Cruz Azul players during a wild melee. VIDEO

In the semis, Santos faces Monterrey, which eliminated Chivas Guadalajara 8-5 on aggregate after a 4-4 tie in the second leg. Guadalajara was the regular-season's overall leader, ahead of Santos.

San Luis advanced to the semifinals over Toluca thanks to its better regular-season record after they finished tied, 1-1, on aggregate. American defender Michael Orozco has not yet seen playoff action for San Luis.

MEXICO Torneo Clausura 08
Semifinals
May 21
San Luis-Cruz Azul
May 22
Monterrey-Santos
May 24
Cruz Azul-San Luis
May 25
Santos-Monterrey