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

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
Hassan Mwakinyo beat Sam Eggington8 Sep 2018
TKO 2· 3.8% chance +1750+2500
3
Caleb Truax beat James DeGale9 Dec 2017
MD 12Won IBF super middleweight title 3.7% chance +1500+2500
4
Andrew Hernandez beat Arif Magomedov21 May 2016
UD 10Hernandez wins WBC / USNBC Middleweight Titles 3.8% chance +1300+2500
5
Dat Nguyen beat Miguel Flores21 Feb 2017
TKO 6· 4.6% chance +1700+2000
6
Mateo Damian Veron beat Lolenga Mock19 Jan 2019
UD 8· 5.1% chance +1800+1800
7
Byron Rojas beat Hekkie Budler19 Mar 2016
UD 12Won WBA minimumweight title 5.1% chance +1100+1800
8
Francesco Patera beat Lewis Ritson13 Oct 2018
SD 12For vacant European lightweight title 5.6% chance +1500+1600
9
Jurmain McDonald beat Evan Holyfield14 May 2022
KO 2· 5.9% chance +1000+1500
10
Benjamin Mendes Tani beat Daniel Lapin23 May 2026
TKO 4Lost IBF Inter-Continental and WBO International light heavyweight titles 6.4% chance +1400+1400
11
Paul Valenzuela Cuesta beat Patrick Teixeira9 Apr 2022
DQ 2· 7.1% chance +1250+1270
12
Jeison Rosario beat Julian Williams18 Jan 2020
TKO 5Won WBA (Super), IBF, and IBO light middleweight titles 7.3% chance +600+1200
13
Andy Ruiz Jr. beat Anthony Joshua1 Jun 2019
TKO 7Won WBA (Super), IBF, WBO, and IBO heavyweight titles 7.9% chance +1000+1200
14
Diego Ramirez beat Bradley Skeete15 Dec 2018
TKO 2For vacant WBO International welterweight title 7.2% chance +1200+1200
15
Robinson Castellanos beat Yuriorkis Gamboa5 May 2017
TKO 7· 7.4% chance +1200+1200
16
Francesco Patera beat Edis Tatli7 May 2017
SD 12Lost European lightweight title 8.0% chance +1000+1100
17
Oscar Mojica beat Paddy Barnes17 Mar 2019
SD 6· 8.4% chance +1150+1050
18
David Brophy beat Zac Dunn17 Mar 2017
TKO 7Lost Commonwealth super middleweight title 8.5% chance +1150+1030
19
Femke Hermans beat Mary Spencer16 Dec 2022
UD 10For vacant IBO light-middleweight title 8.4% chance +750+1000
20
James Martin beat Vito Mielnicki Jr.17 Apr 2021
MD 8· 8.5% chance +1000+1000
21
Petros Ananyan beat Subriel Matías22 Feb 2020
UD 10· 8.5% chance +1000+1000
22
Jose Maria Cardenas beat Antonio Vargas25 May 2019
KO 1· 8.5% chance +1000+1000
23
Jason Welborn beat Marcus Morrison25 Mar 2017
UD 10Won WBC International Silver middleweight title 8.7% chance +950+1000
24
Alexander Dimitrenko beat Adrian Granat18 Mar 2017
TKO 1Lost IBF International heavyweight title 8.7% chance +700+1000
25
Craig Cunningham beat Anthony Ogogo22 Oct 2016
TKO 8For vacant WBC International middleweight title 8.8% chance +550+1000
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