Steve Landers Racing's Royal Prince (Cairo Prince) is the 7-2 morning-line favorite in the GIII Cecil B. DeMille S. at Del Mar Sunday. The Brad Cox trainee came home first at Kentucky Downs Sept. 7, but with the gates sprung before the full field was loaded, the race was determined to be a non-wagering event. The gray colt, a half-brother to last year's champion juvenile filly British Idiom (Flashback), officially broke his maiden going 1 1/16 miles over the turf at Keeneland Oct. 2. Cutting back to a mile Sunday,...