Topp was drafted by the New York Giants in the 13th round (148th overall pick) of the 1954 NFL Draft.
 He signed with the Giants in February 1954, and played in six games for the team during the 1954 NFL season.
He had six receptions for 90 yards and three touchdowns in 1954.

After the 1954 season, Topp was inducted into the United States Air Force and missed the 1955 season.
 In March 1956, the Giants signed Topp to a contract for the 1956 season.
 In October 1956, the Giants upset the Cleveland Browns, 21-9, after intercepting the radio signals being used by the Browns to relay plays from the bench to a small receiver inside the quarterback's helmet.
 There was no rule prohibiting the practice at the time, and Giants' general manager Ray Walsh boasted to the press about their success.
 Walsh told the press that Topp was on the bench with a receiving set listening to the signals coming from the Browns' bench.
 Topp was able to hear the signals more clearly than the Browns' quarterback and relayed them to assistant coach Tom Landry, who then relayed them to the defensive unit on the field.
Topp was drafted by the New York Giants in the 13th round (148th overall pick) of the 1954 NFL Draft.  He signed with the Giants in February 1954, and played in six games for the team during the 1954 NFL season. He had six receptions for 90 yards and three touchdowns in 1954.
After the 1954 season, Topp was inducted into the United States Air Force and missed the 1955 season.  In March 1956, the Giants signed Topp to a contract for the 1956 season.  In October 1956, the Giants upset the Cleveland Browns, 21-9, after intercepting the radio signals being used by the Browns to relay plays from the bench to a small receiver inside the quarterback's helmet.  There was no rule prohibiting the practice at the time, and Giants' general manager Ray Walsh boasted to the press about their success.  Walsh told the press that Topp was on the bench with a receiving set listening to the signals coming from the Browns' bench.  Topp was able to hear the signals more clearly than the Browns' quarterback and relayed them to assistant coach Tom Landry, who then relayed them to the defensive unit on the field.
Bob Topp