|Full name||Gerardus Antonius Frederikus Hylkema|
|Date of birth||February 14, 1946|
|Place of birth||Groningen, Netherlands|
|Date of death||26 March 2002|
|Place of death||Acapulco, Mexico|
|1975||San Antonio Thunder||3||(0)|
|1980||Golden Gate Gales|
|* Senior club appearances and goals counted for the domestic league only.
Hylkema began his athletic career in field hockey. In 1968, he was part of the Dutch field hockey team at the 1968 Summer Olympics. In 1970, he turned to professional soccer when he signed with FC Groningen but he spent his first season with the reserves. In 1971, Hylkema gained promotion to the first team where he saw limited time over two seasons. He then played for Atlante F.C. in Mexico. In 1975, Hylkema played three games for the San Antonio Thunder of the North American Soccer League. In 1976, he played for the Oakland Buccaneers of the American Soccer League. In 1977 and 1978, he played for the Sacramento Gold. In 1980, the Golden Gate Gales selected Hylkema in the ASL Dispersal Draft. After he retired from playing professionally, Hytlkema settled in the San Francisco Bay area where he coached.