Two weeks after his Belmont Stakes win, Omaha took on older horses for the first time in the Brooklyn Handicap. He was no match for the four-year-old Discovery, who won by six lengths from King Saxon in record time of 1:48.2 for nine furlongs. Omaha was a further four lengths back in third. A week later, he returned to his own age group for the Dwyer Stakes. Ridden by Wayne Wright, he defeated the CCA Oaks winner Good Gamble by one and a half lengths. On July 21, Omaha started 2/5 favorite for the Arlington Classic in front of a crowd of 40,000 in Chicago. He took his winnings for the season to $142,225 by winning in track record time from St Bernard, Bloodroot, and Black Helen. He was reported to be lame in August and missed the rest of the season, although the exact nature of his injury was never fully explained.