BOXINGAPI

Biggest boxing upsets

When the price was wrong.

Every priced bout carries its opening and closing line, so every underdog win can be ranked by how unlikely the market said it was. Built from our results and our odds since 2016, refreshed every hour.

619underdog wins
1 in 8priced bouts
+2750the longest
Closing price4 Aug 2018
Underdog won

Viviane Obenauf beat Natasha Jonas

TKO 4 · Lost WBA International female super-featherweight title
Closing price+2750
Chance it implied3.4%

The list

Women's bouts, ranked by the closing price

Each view has its own address: a year, title fights or women's bouts.

#BoutMethodTitleChanceOpeningClosing price
1
Viviane Obenauf beat Natasha Jonas4 Aug 2018
TKO 4Lost WBA International female super-featherweight title 3.4% chance +1800+2750
2
Femke Hermans beat Mary Spencer16 Dec 2022
UD 10For vacant IBO light-middleweight title 8.4% chance +750+1000
3
Jessica Gonzalez beat Tatyana Zrazhevskaya11 Sep 2021
SD 10Lost WBC interim female bantamweight title 9.3% chance +1100+900
4
Kirstie Bavington beat April Hunter16 Oct 2021
PTS 6· 10.4% chance +750+800
5
Karla Ramos Zamora beat Jessica Camara16 Mar 2023
TKO 4· 12.6% chance +600+650
6
Catherine Tacone Ramos beat Shannon Courtenay19 Oct 2024
PTS 6· 13.4% chance +730+600
7
Indeya Smith beat Sulem Urbina21 Dec 2022
UD 8· 13.2% chance +650+600
8
Edith Soledad Matthysse beat Samantha Worthington22 Feb 2026
RTD 8Won Interim WBA female light-welterweight title 14.6% chance +500+540
9
Tiara Brown beat Skye Nicolson22 Mar 2025
SD 10Lost WBC female featherweight title 15.5% chance +300+500
10
Shannon O'Connell beat Jasmine Parr13 Dec 2024
SD 8· 15.8% chance +560+500
11
Jessica Nery Plata beat Kim Clavel13 Jan 2023
UD 10Lost WBC light-flyweight title; For WBA light-flyweight Super title 15.5% chance +350+500
12
Elif Nur Turhan beat Shauna Browne1 Mar 2025
TKO 1· 16.7% chance +540+450
13
Miyo Yoshida beat Ebanie Bridges9 Dec 2023
UD 10Lost IBF female bantamweight title 17.6% chance +400+430
14
Irma García beat Emma Dolan5 Apr 2026
TKO 3For IBF female super-flyweight title 18.6% chance +310+400
15
Shadasia Green beat Savannah Marshall11 Jul 2025
SD 10Lost IBF female super-middleweight title; for WBO female super-middleweight title 18.5% chance +260+400
16
Lani Daniels beat Shadasia Green17 Apr 2026
TKO 9Won IBF, WBO and The Ring female super-middleweight titles 19.5% chance +360+360
17
Elin Cederroos beat Alicia Napoleon Espinosa10 Jan 2020
UD 1010 Rounds - Super Middleweight (WBA/IBF World Championship Title) 20.5% chance +300+350
18
Yokasta Valle beat Joana Pastrana4 Aug 2019
SD 10Lost IBF female mini-flyweight title 20.9% chance +450+350
19
Emma Dolan beat Shannon Ryan22 Jun 2024
SD 10Retained Commonwealth female super-flyweight title and won inaugural British female super-flyweight title 21.0% chance +310+333
20
Elif Nur Turhan beat Beatriz Ferreira6 Dec 2025
TKO 5Lost IBF female lightweight title 22.8% chance +260+300
21
Terri Harper beat Rhiannon Dixon28 Sep 2024
UD 10Won WBO female lightweight title 23.1% chance +320+300
22
Nataly Delgado beat Jasmine Artiga13 Jun 2026
UD 10Won WBA super-flyweight title 23.8% chance +250+290
23
Jasmina Zapotoczna beat Maisey Rose Courtney6 Jul 2024
UD 10Won vacant WBA female flyweight International title 24.7% chance +250+275
24
Flora Pili beat Silvia Bortot5 May 2023
SD 10· 25.5% chance +275+275
25
Yuko Kuroki beat Monserrat Alarcón5 Aug 2023
MD 10Lost WBA female atomweight title; For WBO female atomweight title 26.9% chance +163+250
Underdog wins, 2016 to 2026

About 1 in 8

of priced professional bouts; 2024 was the wildest year at 16%
2016: 49 of 462 (10.6%) 16 11% 2017: 50 of 443 (11.3%) 17 2018: 56 of 451 (12.4%) 18 2019: 64 of 550 (11.6%) 19 2020: 38 of 316 (12.0%) 20 2021: 56 of 489 (11.5%) 21 2022: 54 of 588 (9.2%) 22 2023: 71 of 605 (11.7%) 23 2024: 97 of 592 (16.4%) 24 16% 2025: 53 of 461 (11.5%) 25 2026: 31 of 304 (10.2%) 26 10%

All underdog winsWon at +300 or more

The biggest upset of each year
  • 2019Mateo Damian Veron beat Lolenga Mock+1800
  • 2020Jeison Rosario beat Julian Williams+1200
  • 2021James Martin beat Vito Mielnicki Jr.+1000
  • 2022Jurmain McDonald beat Evan Holyfield+1500
  • 2023Larry Fryers beat Dimash Niyazov+900
  • 2024Travis Floyd beat Chase Martinez+900
  • 2025Armando Reséndiz beat Caleb Plant+900
  • 2026Benjamin Mendes Tani beat Daniel Lapin+1400
01

How they are ranked

By the winner's closing price: the last price before the first bell, the best across the books we read. The chance shown is that price with the bookmaker's margin taken out.

02

What counts

Professional bouts with a price on both sides and a decided winner. Draws and no contests are left out; a disqualification counts as the result it was.

Every upset in one call: GET /v1/upsets?min_odds=300

Read the odds and upsets guide