Nitrous, who ran third in last year's Grade 1 Hopeful at Saratoga, will make his two-turn debut Sunday in the $100,000 Riley Allison Derby at Sunland Park. The race is the first of two local preps for the Grade 3, $800,000 Sunland Park Derby. 

The Riley Allison, at a mile, drew a field of 10. Nitrous will break from post 8. Trainer Steve Asmussen has given the mount to Luis Contreras. 

The race also drew Sheriff Brown, a half-brother to Runaway Ghost, the winner of last year's Sunland Derby. 

The card Sunday includes the $65,000 Borderplex, which is a local steppingstone to the $200,000 Sunland Park Oaks.