At stud, Roberto sired many important winners including Sunshine Forever, Touching Wood, Real Shadai, At Talaq, Lear Fan, Kris S. and Dynaformer.
On his seasonal debut he finished third to Trojan Fen in the Feilden Stakes at Newmarket in April and was then sent back to Italy to contest the Derby Italiano and was beaten a short-head into second place by Welnor with At Talaq in third.
He went on to finish third to Estrapade in La Coupe de Maisons-Laffitte in September and third to Gay Lemur in the St Simon Stakes at Newbury Racecourse in October.
[5] On his first appearance as a four-year-old, Bob Back finished third behind Elegant Air and Parliament in the Group Three Westbury Stakes at Sandown Park Racecourse in April.
After finishing unplaced in his next race he was sent to Italy for the Group One Premio Presidente della Repubblica over 2000 metres at Capannelle Racecourse in May and won by two and a half lengths from Reco.
[6] Bob Back went on to finish third behind Pebbles and Rainbow Quest in the Eclipse Stakes, but ran poorly when unplaced behind Commanche Run in the Benson and Hedges Gold Cup.
Bob Back was then sold to Bruce McNall and sent to the United States where he was trained by Angel Penna Sr. On his American debut he produced a good performance when finishing second by a neck to the gelding Win in the Man o' War Stakes at Belmont Park.
[6] Although it was reported that he would be retired to stud at the end of the 1985 season, Bob Back continued to race for two more years in North America in the ownership of Allen Paulson.