Answer by taking a quote from the following article:

Stephen Roche (; born 28 November 1959) is an Irish former professional road racing cyclist. In a 13-year professional career, he peaked in 1987, becoming the second of only two cyclists to win the Triple Crown of victories in the Tour de France and the Giro d'Italia stage races, plus the World road race championship, the first was Eddy Merckx. Roche's rise coincided with that of fellow Irishman Sean Kelly. Although one of the finest cyclists of his generation and admired for his pedalling style, he struggled with knee injuries and never contended in the Grand Tours post-1987.

Roche scored his first professional victory by beating Bernard Hinault in the Tour of Corsica. Less than a month later he won Paris-Nice (where he became the first, and still the only, new pro to win Paris-Nice) despite illness following the descent from Mont Ventoux and finished his debut season with victories in the Tour de Corse, Circuit d'Indre-et-Loire and Etoile des Espoirs races with a second place behind Hinault in the Grand Prix des Nations. In total, his debut yielded 10 victories. In 1982 his best performance was second in the Amstel Gold Race behind Jan Raas, but his rise continued in 1983 with victories in the Tour de Romandie, Grand Prix de Wallonie, Etoile des Espoirs and Paris-Bourges. In the 1983 Tour de France, Roche finished 13th and he finished the 1983 season with a bronze medal in the world cycling championship at Alterheim in Zurich. In 1984, riding for La Redoute following contractual wrangles with Peugeot (the settlement of which led Roche to sport Peugeot shorts for two years before winning a court action against Velo Club de Paris Peugeot) he repeated his Tour de Romandie win, won Nice-Alassio, Subida a Arrate and was second in Paris-Nice. He finished 25th in that year's Tour de France. In 1985, Roche won the Criterium International, the Route du Sud and came second in Paris-Nice and third in Liege-Bastogne-Liege. In the 1985 Tour de France Roche won stage 18 to the Aubisque and finished on the podium in 3rd position, 4 minutes and 29 seconds behind winner Bernard Hinault.

Did he have any other major victories?
he won Paris-Nice (where he became the first, and still the only, new pro to win Paris-Nice) despite illness