Before Curt Rayborn's career began he was part of a 6-1 traded that brought him and 5 other players to the Pirates for Danny O'Connell. 

He debuted in 1958 and had a notable 8-4 season as a rookie for the 1958 Pittsburgh Pirates. He had some noteable events:

He pitched a four-hit shutout against the San Francisco Giants on July 25, 1958, for his only career shutout and one of two complete games.

August 9th, 1958, Curt Raydon wins his 6th buts gives up 2 runs in the 5th‚ breaking the Pirate pitchers scoreless streak at Forbes of 45 2/3 innings.

Sep 8, 1958 - Roberto Clemente hits 3 triples in a 4-1 win over Cincinnati. Raydon gets the win and (8-4) collects his only ML hit in the 5th to ignite a 3-run rally. This is also his last ML decision. Rayborn walked 6 other times during the season reaching base a total of 7 times. In total he went 1 for 38 with 2 runs scored for a .026 batting average. 

After 1958 he never again pitched in the majors. He was back in the minors for 1959, in the minors after that, pitching well in 15 games going 7-4 with a 2.89 ERA in 1959, and while he was expected to come back to the majors (Topps issued a 1960 Pirates baseball card for him), it never happened. He later became a policeman.