Atomweight
Weight class in combat sports
From Wikipedia, the free encyclopedia
Atomweight (also referred to as light minimumweight, junior strawweight, junior mini-flyweight and pinweight) is a weight class in combat sports.
Boxing
In women's boxing and junior amateur boxing pinweight is, or has been, a weight class for boxers weighing in under 102 pounds (46 kg) (before 2003, 45 kg).
In September 2010 the women's class in amateur boxing was partly merged into an extended 45–48 kg light flyweight division, with women weighing less than 45 kg excluded from competition. Pinweight is still defined for junior contests.
Women's professional champions
Current Champions (Last updated on December 22, 2025)
| Sanctioning Body | Reign Began | Champion | Record | Defenses |
|---|---|---|---|---|
| WBA | November 21, 2025 | Isabel Rivero | 12–3–1 (1 KO) | 0 |
| WBC | October 25, 2025 | Camila Zamorano | 13–0 (1 KO) | 1 |
| IBF | vacant | |||
| WBO | vacant | |||
Current The Ring world rankings
As of December 22, 2025.[1]
Keys:
- C Current The Ring world champion
| Rank | Name | Record | Title(s) |
|---|---|---|---|
| C | vacant | ||
| 1 | Sumire Yamanaka | 9–1 (3 KO) | |
| 2 | Camila Zamorano | 13–0 (1 KO) | WBC |
| 3 | Eri Matsuda | 8–2–1 (1 KO) | |
| 4 | Esneidy Rodriguez Olmos | 11–0–1 (1 KO) | |
| 5 | Nao Ugawa | 6–0 (0 KO) |
Women's Amateur Champions
Mixed Martial Arts
The atomweight division in mixed martial arts generally refers to competitors weighing less than 105 lb.
