Ross was known as a smart fighter with great stamina. He retained his title by decision against Sammy Fuller to finish 1933 and against Peter Nebo to begin 1934. Then he defended against former world champion Frankie Klick, against whom he drew in ten. Then came the first of three bouts versus Jimmy McLarnin. Ross vacated the light welterweight title to go after McLarnin's welterweight title and won by a 15-round decision, his third world championship. However, in a rematch a few weeks later, McLarnin beat Ross by a decision and recovered the title. After that, Ross went back down to light welterweight and reclaimed his title with a 12-round decision over Bobby Pacho. After beating Klick and Henry Woods by decision to retain that title, he went back up in weight for his third and last fight with McLarnin; he recovered the welterweight title by outpointing McLarnin again over 15 rounds. He won 16 bouts in a row after that, including three over future world middleweight champion Ceferino Garcia and one against Al Manfredo. His only two defenses, however, over that stretch were against Garcia and against Izzy Jannazzo, on points in 15 rounds.