1989 | Australian Open | French Open | 1989 in music | Open University | open source | U.S. Open | Tiananmen Square protests of 1989 | Wacken Open Air | 1989 in baseball | The Open Championship | Batman (1989 film) | U.S. Open (tennis) | Official Secrets Act 1989 | All England Open Badminton Championships | 1989 in television | U.S. Open (golf) | The Little Mermaid (1989 film) | Open Source | Open-pit mining | Glory (1989 film) | 2006 Australian Open | 1989 in film | 1989–90 in English football | Open Software Foundation | Indira Gandhi National Open University | 1989 World Series | Lamar Hunt U.S. Open Cup | 2005 Australian Open – Men's Singles | U.S. Women's Open |
Williamson played only in the men's doubles at the 1989 US Open, with Nduka Odizor.