Australia: Australian Open - Doubles - Main
1/32-finals DeVries S./MacPherson D. Borwick N./Lewis D. 2:0 (7:5, 6:3) details 14.01.1991
New Zealand: Wellington - Doubles - Main
1/8-finals Engel D./Lewis D. Guy S./Steven B. 1:2 (4:6, 6:4, 3:6) details 31.12.1990
Switzerland: Geneva - Doubles - Main
Final Albano P./Engel D. Borwick N./Lewis D. 2:0 (6:3, 7:6) details 16.09.1990
Semi-finals Cane P./Mezzadri S. Borwick N./Lewis D. 1:2 (6:4, 5:7, 6:7) details 15.09.1990
Quarter-finals Borwick N./Lewis D. Colombo S./Olhovskiy A. 2:1 (7:6, 3:6, 6:2) details 13.09.1990
1/8-finals Jonsson L./Strelba M. Borwick N./Lewis D. 0:2 (5:7, 0:6) details 10.09.1990
USA: New Haven 2 - Doubles - Main
1/8-finals Borwick N./Lewis D. Fitzgerald J./Jarryd A. 0:2 (6:7, 3:6) details 15.08.1990
USA: Long Island - Doubles - Main
1/8-finals Nelson T./Shelton B. Borwick N./Lewis D. 2:1 (6:7, 6:4, 7:6) details 13.08.1990
USA: New Haven 2 - Doubles - Main
1/16-finals Caratti C./Herrera L. Borwick N./Lewis D. 0:2 (1:6, 6:7) details 13.08.1990
United Kingdom: Wimbledon - Doubles - Qualification
Quarter-finals Borwick N./Lewis D. Foster A./Ireland D. 0:2 (63 :7, 4:6) details 25.06.1990
South Korea: Seoul - Doubles - Main
1/8-finals Connell G./Michibata G. Lewis D./Russell J. 2:0 (6:3, 6:4) details 16.04.1990
Japan: Tokyo - Doubles - Main
1/8-finals Lewis D./Russell J. Brown N./Carlsson J. 1:2 (5:7, 6:4, 4:6) details 11.04.1990