Genois had his best tour results by some margin in 1978. He played in the newly formed challenger tour, reaching the semi-final of the third ever challenger tournament, and first American one, in Shreveport. He and partner Ramiro Benavides, of Bolivia, won the doubles title. The following week at the Birmingham Challenger Genois reached the third round in the singles event. The week after the Asheville Challenger was held with Réjean reaching the second round in singles and taking the title in doubles, again partnering Benavides.