Jockey Abel Cedillo is atop the standings at the Santa Anita autumn meeting through Friday, seeking his first riding title on this circuit.
Cedillo has won eight races, one more than Drayden Van Dyke and two in front of Jorge Velez and Evin Roman.
O'Neill has a more comfortable advantage. Through Friday, he has 11 wins, four more than Phil D'Amato.
Cedillo and O'Neill have Marrazano (4) in the first race. With 25 minutes to post, Marrazano is the 3-5 favorite in a field of four.