In 1954, the Milwaukee Hawks selected Pettit second in the first round of the NBA Draft after the Baltimore Bullets' selection of Frank Selvy. With $100 in the bank, he signed a contract with Hawks owner Ben Kerner for $11,000 – an all-time high for an NBA rookie then. Pettit's awkward ballhandling and a lack of strength to battle NBA bruisers weighing 200 pounds that early in his career, had Hawks coach Red Holzman move him from center, his position at LSU, to forward in his first training camp. "In college I played the standing pivot", he said in a April 1957 issue of SPORT magazine interview. "My back was to the basket. In the pros, I'm always outside. Everything I do is facing the basket now. That was my chief difficulty in adjusting, the fact that I had never played forward before." Though many were skeptical about Pettit making the transition from college to the rough-and-tumble NBA, in 1955 he won the NBA Rookie of the Year Award after averaging 20.4 points and 13.8 rebounds per game. He became the second rookie to win all-NBA honors but the team finished last in the Western Division. After the season, the Hawks moved to St. Louis.