Autumn Lavertu

Champion Nitrogen (Medaglia d'Oro) returned to the work tab Sunday morning at Oaklawn with a bullet half-mile work over a fast track for dual Hall of Fame trainer Mark Casse. Nitrogen, under two-time Oaklawn riding champion Cristian Torres, was clocked in :46.40, fastest of 56 published works at the distance. Nitrogen was breezing for the first time since finishing third in Mar. 7 GII Azeri Stakes. Last year's champion 3-year-old filly remains on target for the Apr. 11 Apple Blossom Handicap. "Nitrogen looked like the old Nitrogen," said assistant trainer...