Which Elton John song was written as a tribute to tennis player Billie Jean King?

"Philadelphia Freedom" was written as a tribute to tennis player Billie Jean King.

Elton John and Bernie Taupin wrote the song, which was released as a single in 1975. John was a close friend of King and served as a supporter of the Philadelphia Freedoms, the professional tennis team associated with her in World Team Tennis.

The recording features a large orchestral arrangement and became one of John's major 1970s hits. It reached number one on the Billboard Hot 100 in the United States.

Although the title sounds like a general patriotic slogan, the song's immediate inspiration was the Philadelphia Freedoms team and King's influence. It is therefore distinct from "Philadelphia Freedom" being simply a song about the city of Philadelphia.