Peter Blum's filly Oh My held off a late challenge to capture the fourth race at Laurel Park and give trainer Brittany Trimble her first career victory. It was the first career starter for Trimble, 28, a former amateur rider and finacee of Laurel-based jockey Sheldon Russell . Oh My ($11.40) broke running in the $40,000 maiden special weight for females 3 and up. ... Apprentice jockey Wes Hamilton, youngest son of Laurel regular Steve "Cowboy" Hamilton, opened Sunday's card with three straight victories. Hamilton, 19, swept the early double with Summer Run ($8.60) in the first and Big Bad Ben ($7) in the second, and won with 3-5 favorite Fly and Flutter ($3.20) in the third. ... The 20-cent Rainbow 6 went unsolved, growing the jackpot carryover to $20,931.91 for the return of racing Friday at 12:30 p.m.