ランディ・マモラ
Roberts continued to ride in selected events in 1984. In March, he battled Spencer to win his second consecutive Daytona 200 and third win overall. In July, Roberts won the first leg of the Laguna Seca 200, then finished second to Randy Mamola in the second leg, as Mamola was declared the winner based on aggregate times. In September 1985, he appeared at the Springfield Mile Grand National dirt track race riding a Mert Lawwill-prepared Harley-Davidson XR750, but failed to make the final.