John Best

Best began his career in England. He played for Liverpool in 1959 under the new manager, Bill Shankly, after which he played seven games with Tranmere Rovers in 1960. In 1967, he moved to the United States where he signed with the Philadelphia Spartans of the National Professional Soccer League (NPSL). In 1968, the NPSL merged with the United Soccer Association to form the North American Soccer League. When the Spartans folded, Best and several of his teammates, transferred to the Cleveland Stokers for the 1969 NASL season. When the Stokers folded at the end of the season, he moved to the Dallas Tornado (NASL). From 1969 to 1973, he played in ninety-three games and was a five-time first team All Star. In 1971, the Tornado won the NASL championship. Best retired at the end of the 1973 season. Best also returned briefly to England in 1968 to play for Fleetwood in the Northern Premier League.

United States national team

Best earned his one cap with the United States national team in a 17 March 1963 game with Bermuda. Best began the game, a 4–0 loss, and came off for Johnny Moore.

In 1974, the NASL expansion team Seattle Sounders began assembling its staff and roster. The owners hired Cliff McCrath, the head coach of the local Seattle Pacific University to fill in the team's roster spots. He hired Best as the team's first head coach. Over his three years as coach, Best compiled a 43–26 record. After leaving the Sounders, Best moved north to become the general manager of the Vancouver Whitecaps. One of his most successful personnel moves was hiring Tony Waiters as head coach. This move and several others led to the Whitecaps winning the 1979 NASL championship. In 1982, the Sounders opened their season 2–7. The team ownership turned to Best who became the Sounders' general manager on 14 June 1982. The Sounders turned their season around and went to the championship game, only to lose to the New York Cosmos. Despite this success, the team was losing money, and after its sale to new ownership in January 1983, Best left the team.