Jack O'Brien
Championship résumé: 4 title reigns across 2 championships, 2,339 total days as champion.
Title Reigns
4
| Mexican National Welterweight Championship CMLL · Live event | Feb 18, 1944 to Apr 20, 1945 | 427 days |
| Mexican National Welterweight Championship CMLL · Live event | Nov 23, 1941 to Mar 1, 1942 | 98 days |
| Mexican National Lightweight Championship CMLL · Live event | May 18, 1938 to May 5, 1940 | 718 days |
| Mexican National Lightweight Championship CMLL · Live event | Jun 28, 1934 to Jun 28, 1937 | 1,096 days |