Amo Racing USA's much-ballyhooed Regent's Park (c, 2, Bolt d'Oro--Spark, by Speightstown), a $1.4-million purchase out of last year's Fasig-Tipton Saratoga Sale, ran to his good looks over a rain-affected Monmouth main track Monday afternoon, scoring by 3 1/4 lengths without being asked a serious question to become a rapid-fire second Memorial Day 'TDN Rising Star' presented by Hagyard. Drawn the rail in a scratched-down field of four, the scopey bay colt was quickly into stride and made the running a path or two off the sloppy inside rail for...