I believe the Rios vs Abril card will be up first from Vegas @9:00 PM ET, after that, my guess is, the action on HBO will switch to JMM vs Fedchenko in Mexico City @ somewhere around 10:00 to 10:30 PM ET

At Las Vegas (HBO PPV): Brandon Rios vs. Richard Abril, 12 rounds, for vacant WBA lightweight title; Mike Alvarado vs. Mauricio Herrera, 10 rounds, junior welterweights.

And:

At Mexico City (HBO PPV): Juan Manuel Marquez vs. Sergey Fedchenko, 12 rounds, for vacant WBO interim junior welterweight title; Saul Roman vs. Richard Gutierrez, 10 rounds, middleweights; Daniel Sandoval vs. Michel Rosales, 10 rounds, welterweights.

The fights start in about 45 mins so i'm off to hunt a stream and a couple Newcastle Brown Ales in the 'fridge.