By Jon White Maggie Slew, the final offspring of 1977 Triple Crown winner Seattle Slew, registered a 6 1/4-length maiden victory in Thursday's first race at Monmouth Park. The 2-year-old Indiana-bred filly, who was ridden by Rajiv Maragh, was sent away as the 6-5 favorite while making her second career start after finishing second at Churchill Downs on July 3."This filly is just so classy, the way she acts, especially for a 2-year-old," Maragh said during an HRTV interview after Maggie Slew's triumph. "When I asked to her to run in the stretch, I couldn't believe how strong she felt."Track announcer Larry Collmus called attention to the fact Maggie Slew is Seattle Slew's final offspring as the fillies were being loaded into the starting gate for the 5 1/2-furlong contest. Fifth early in the field of seven, Maggie Slew rallied wide into the stretch, took command soon after passing the furlong marker and drew off to win with authority in 1:05.17.Trained by David Vance, Maggie Slew was bred by her owners, Don and Dana Myers (Swifty Farms). The filly's dam is May Day Ninety, an unraced daughter of Alydar. May Day Ninety also has produced multiple grade III winner Roza Robata and stakes winner Burger Day.Seattle Slew died May 7, 2002, the 25th anniversary of his Kentucky Derby win.Maggie Slew, the last of four foals from Seattle Slew's final crop, was listed as reserve not attainted on a final bid of $600,000 at last year's Fasig-Tipton Saratoga yearling sale.