The men's 4 × 100 metre medley relay competition at the 1999 Pan Pacific Swimming Championships took place on August 29 at the Sydney International Aquatic Centre. The last champion was the United States.ISHOF list with all medalists in Pan Pacific Championships history

Records Prior to this competition, the existing world and Pan Pacific records were as follows: World recordJeff Rouse (53.95) Jeremy Linn (1:00.32)Mark Henderson (52.39)Gary Hall, Jr. (48.18)3:34.84Atlanta, United StatesJuly 26, 1996Pan Pacific Championships recordLenny Krayzelburg (54.74)Kurt Grote (1:00.59)Nate Dusing (52.67)Neil Walker (49.03)3:36.93Fukuoka, JapanAugust 13, 1997

Results All times are in minutes and seconds.

KEY:qFastest non-qualifiersQQualifiedCRChampionships recordNRNational recordPBPersonal bestSBSeasonal best

Heats Heats weren't performed, as only six teams had entered.

Final The final was held on August 29. Rank Name Nationality Time Notes Lenny Krayzelburg (53.67) Kurt Grote (1:01.69) Dod Wales (52.49) Neil Walker (48.52) 3:36.37 CR Mark Versfeld (55.47) Morgan Knabe (1:01.54) Mike Mintenko (53.69) Yannick Lupien (49.48) 3:40.18 Atsushi Nishikori (55.72) Ryosuke Imai (1:02.14) Takashi Yamamoto (52.42) Shunsuke Ito (49.93) 3:40.21 4 Simon Thirsk (57.08) Terence Parkin (1:03.74) Theo Verster (54.07) Nicholas Folker (50.05) 3:45.39 5 Scott Talbot-Cameron (58.20) Steven Ferguson (1:03.84) Nicholas Sheeran (56.02) Brad Herring (51.72) 3:49.78 - Matt Welsh (55.32) Simon Cowley (1:01.60) Geoff Huegill (51.84) Michael Klim (47.78) DSQ

References