 He won his second fight in February 1975 by technical knockout in round 7, and challenged Perico Fernandez for the WBC light welterweight title in his third professional fight.He defeated Fernandez by technical knockout in the 8th round on July 15, 1975, to set a world record for taking the shortest time to win the world title; it had been less than a year since he made his debut in 1974.Saensak lost his world title in his second defense against Miguel Velasquez after being disqualified in the 5th round, but quickly regained it four months later on October 29, 1976, by knocking out Velázquez in two rounds.