The Under 20's Challenge, which is open to New York Racing Association trainers with fewer than 20 horses, will be split into two divisions for the upcoming winter and spring meets at Aqueduct. Division A will include trainers with 11-20 stalls and Division B will be limited to trainers with 1-10 stalls. The competition will begin Jan. 1 and will conclude with the end of the Spring meet Apr. 30 The top-six trainers in Division A will share a prize pool of $60,000 with the winner receiving $16,000. The top-five...