ARCADIA, Calif. — Royal Mo won the $150,000 Robert B. Lewis Stakes by 3½ lengths Saturday at Santa Anita, giving owners Jerry and Ann Moss a second contender for the Kentucky Derby. Ridden by Victor Espinoza, Royal Mo ran 1 1/16 miles in 1:43.48. The 3-year-old colt trained by John Shirreffs earned 10 points toward
