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The 1988 Frankfurt Cup, was a men's tennis tournament played on indoor carpet courts and in Frankfurt, West Germany that was part of the 1988 Grand Prix circuit. It was the second edition of the tournament was held from 17 October until 23 October 1988. First-seeded Tim Mayotte won the singles title.
John Barrett, ed. (1989). The International Tennis Federation : World of Tennis 1989. London: Willow Books. pp. 111, 157. ISBN9780002183116.
McManus, Jim (2010). History of Tournaments: Professional Tennis Winners and Runner-ups. Pont Vedra Beach: MAC and Company Publishing. pp. 231–232. ISBN9781450728331.
Tim Mayotte
Rüdiger Haas / 
Goran Ivanišević
Leonardo Lavalle, 4–6, 6–4, 6–3
Jeremy Bates / 
Tom Nijssen, 1–6, 7–5, 6–3