Santa Rosa residents Ricardo Davalos, 21, and Devante Raushad Love, 20, were identified as suspects in the robbery, which occurred in the casino parking lot around 6:30 a.m., with the help of casino security, sheriff's office officials said.
Davalos was arrested in the Roseland area during a traffic stop, and Love was arrested at the county jail after detectives arranged for his surrender, officials said.
The victim in the robbery, described as a 68-year-old man, was struck in the head with an unknown object and robbed outside the casino, according to the sheriff's office.
The victim said he was robbed by two suspects, who stole an undisclosed amount of cash and personal property, the sheriff's office said.
The victim was taken to Memorial Hospital to be treated for severe head trauma, the sheriff's office said.