Trainer Assaf Ronen was to begin serving a seven-day suspension on Friday after one of his horses tested positive for a banned substance at Aqueduct last month. The suspension was reduced from 15 days for Ronen waiving his right of appeal. Ronen was also fined $1,000. Ronen was penalized for the finding of the drug flunixin, a nonsteroidal antiinflammatory, in the postrace sample of Sezzana, who finished third in the first race at Aqueduct on Feb. 19. Sezzana was disqualified from purse money and ordered unplaced. Ronen is 3 for 19 at the Aqueduct inner track meet.