STICKNEY, Ill. - Emmanual Esquivel had never ridden in a race before the Hawthorne meet began in mid-February, but it took Esquivel almost no time to hit his stride. Less than two months into his career, Esquivel, still with a seven-pound apprentice weight allowance, has gone 20 for 120 at the Hawthorne meet, tying him for third in the jockey standings here.