The 62-year-old LaRussa gave two breath samples and was determined to have a blood alcohol content of 0.093 percent, Jupiter police said in a statement. Florida's legal driving limit is 0.08 percent.
Undercover officers first saw LaRussa's SUV partly in an intersection around midnight and not moving despite several green lights, police said. Officers knocked on the vehicle's window and LaRussa did not initially respond.
The SUV was in drive and running, with LaRussa's foot on the brake, police said. When he eventually woke up, the officers asked him to get out of the car.
He was arrested and booked in the Palm Beach County jail on the misdemeanor about 4 a.m., according to police and jail records, reports AP.
The Cardinals play spring training games at Roger Dean Stadium in Jupiter.