- Name: Jack Duffy
- Pro MMA Record: 4-0-0 (Win-Loss-Draw)
- Nickname: The Fury
- Current Streak: 4 Wins
- Age: 23 | Date of Birth: 1995.10.02
- Last Fight: November 04, 2017 in GKO
- Weight Class: Flyweight | Last Weigh-In: 130.4 lbs
- Affiliation: MMA Gold Fight Team
- Height: 5'7" (170cm) | Reach: N/A
- Career Disclosed Earnings: $0 USD
- Born: San Francisco, California
- Fighting out of: Sacramento, California
Regional Rankings Rankings FAQ
updated Mon Jun 24 14:23:32 2019#18Jack Duffy is the 18th ranked of 91 active California Pro Flyweights.
Also ranked at: Bantamweight (45th)
updated Sun Jun 23 13:31:13 2019#30Jack Duffy is the 30th ranked of 149 active US West Pro Flyweights.
Also ranked at: Bantamweight (64th)
updated Mon Jun 24 04:09:56 2019#104Jack Duffy is the 104th ranked of 488 active United States Pro Flyweights.
Also ranked at: Bantamweight (225th)