1989 Monte Carlo Open – Singles
Introduction Alberto Mancini won in the final 7–5, 2–6, 7–6, 7–5 against Boris Becker.Ivan Lendl was the defending champion but did not compete this year.
Seeds A champion seed is indicated in bold text while text in italics indicates the round in which that seed was eliminated. All sixteen seeds received a bye to the second round.#  Mats Wilander ''(semifinals)''#  Boris Becker ''(final)''#  Kent Carlsson ''(withdrew)''#  Jakob Hlasek ''(second round)''#  Jimmy Connors ''(second round)''#  Henri Leconte ''(second round, retired)''#  Emilio Sánchez ''(second round)''#  Guillermo Pérez Roldán ''(quarterfinals)''#  Jonas Svensson ''(third round)''#  Ronald Agénor ''(quarterfinals)''#  Slobodan Živojinović ''(second round)''#  Andrei Chesnokov ''(second round)''#  Horst Skoff ''(semifinals)''#  '''Alberto Mancini (champion)'''#  Mark Woodforde ''(second round)''#  Jordi Arrese ''(third round)''
Draw ===Key======Finals======Top half=======Section 1========Section 2=======Bottom half=======Section 3========Section 4====
External links *  1989 Monte Carlo Open draw