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Kill The Body

and the head will die

Badou Jack vs Francisco Sierra — record, stats and common opponents compared

🇸🇪SWEDEN

Badou Jack

🇲🇽MEXICO

Francisco Sierra

Badou Jack (29-4-3) and Francisco Sierra (26-10-1) are compared on record, finishing method, activity, and common opponents on Kill The Body. The two have met once. They share 3 common opponents.

Jack

29

Wins17 KO · 59%

4

Losses

3

Draws36 tracked bouts

Sierra

26

Wins23 KO · 88%

10

Losses

1

Draw37 tracked bouts

Head to Head

Jack leads 1–0

Badou Jack and Francisco Sierra have met 1 time; Jack leads 1–0.

Badou Jack and Francisco Sierra have met 1 time; Jack leads 1–0.
Met2014Dec 12Series
Badou JackFighter AWWon1–0W–L
Francisco SierraFighter BLLost0–1W–L
ResultTKOR61Meeting

The Numbers

Jack 4 · Sierra 4 of 8 measurable rows
JackSierra
Record
29-4-3 (edge)26-10-1
Win %0–100%
84.7% (edge)
71.6%
Wins by knockoutmax 23
17
23 (edge)
KO rate0–100%
58.62%
88.46% (edge)
Stoppage rate (tracked wins)†0–100%
59%
88% (edge)
Times stopped†max 7
1 (edge)
7
Title reignsmax 3
3 (edge)
0
Bouts per year‡max 3.6
2.2
3.6 (edge)
Bouts trackedcoveragemax 37
36
37

† Counted from bouts Kill The Body has ingested, not a career total. · ‡ Across each fighter's tracked career span. · Bars are scaled per row — percentages on 0–100, counts against the larger of the two. Every figure is also printed as text.

Tale of the Tape

Heightnot held
Badou Jack: 6′1″
Francisco Sierra: No height on file
Reach+1″
Badou Jack: 73″
Francisco Sierra: 74″ (edge)
Age4 yrs apart
Badou Jack: 42
Francisco Sierra: 38
Stance
Badou Jack: Not recorded
Francisco Sierra: Orthodox

Badou Jack left, Francisco Sierra right, as everywhere on this page. Age is stated, not scored — neither age nor stance carries an edge.

How They Win

Tracked bouts only
Badou Jack29 wins · from 36 tracked bouts

Badou Jack: 29 tracked wins — 17 by KO/TKO (59%), 11 on the cards (38%) and 1 by another method or unrecorded (3%). Counted from 36 bouts Kill The Body has ingested.

17 by KO/TKO 59%11 on the cards 38%1 by another method or unrecorded 3%

Francisco Sierra26 wins · from 37 tracked bouts

Francisco Sierra: 26 tracked wins — 23 by KO/TKO (88%), 2 on the cards (8%) and 1 by another method or unrecorded (4%). Counted from 37 bouts Kill The Body has ingested.

23 by KO/TKO 88%2 on the cards 8%1 by another method or unrecorded 4%

One square per tracked win. Counted from the bouts Kill The Body has ingested for each fighter — Badou Jack 36, Francisco Sierra 37 — not from a career-complete method table.

Common Opponents

3 shared

3 shared · Jack better on 2 · even on 1

Jack

Opponent

Sierra

  • Badou Jack

    Loss, UD

    2019

    BrowneEven

    Francisco Sierra

    Loss, TKO 4

    2015

  • Badou Jack

    Win, SD

    2015

    GrovesJack better

    Francisco Sierra

    Loss, TKO 6

    2012

  • Badou Jack

    Draw, MD

    2013

    PeribánJack better

    Francisco Sierra

    Loss, MD

    2012

Both sides are set at the same size on purpose. Kill The Body does not score a second-round knockout above a split decision — the edge counts losses first and wins as the tiebreak, and the rest is yours to argue. Shared opponents are matched on fighter identity, not on name, so two different fighters with the same name never merge into one row.

Current Form

Oldest left · newest right

Badou Jack had won four in a row before losing a decision to Noel Mikaelian. Jack last boxed on Dec 13, 2025 — 314 days ago.WWWWL

Atiyo May 2022Rivera Aug 2022Makabu Feb 2023Mikaelian May 2025Mikaelian Dec 20252.2 tracked bouts per year

Francisco Sierra last boxed on Dec 5, 2015 — 3,975 days ago. Sierra had lost three straight, after one straight win.LWLLL

Peribán Nov 2012Rios Nov 2014Jack Dec 2014Gvozdyk Sep 2015Browne Dec 20153.6 tracked bouts per year

Common Questions

With the rows behind them
Have Badou Jack and Francisco Sierra ever fought each other?
Yes. Badou Jack and Francisco Sierra met once on December 12, 2014, and Badou Jack won by TKO in round 6.
The meeting

WDec 12, 2014 · Jack · TKO R6

Head to Head ↓
Who has the better record, Jack or Sierra?
Badou Jack is 29-4-3 and Francisco Sierra is 26-10-1. Badou Jack has the higher win percentage.
Records · win %

Jack29–4–384.7%

Sierra26–10–171.6%

The Numbers ↓
Who has more knockouts, Jack or Sierra?
Badou Jack has 17 knockout wins and Francisco Sierra has 23. Francisco Sierra has more.
Knockout wins · KO rate

Jack1758.6%

Sierra2388.5%

The Numbers ↓
Do Jack and Sierra have any common opponents?
Badou Jack and Francisco Sierra share 3 common opponents: Marcus Browne, George Groves and Marco Antonio Peribán. Badou Jack fared better against 2 of them.
3 shared opponents

Marcus BrowneLL

George GrovesWL

Marco Antonio PeribánDL

Common Opponents ↓
How much fight data does Kill The Body have on Jack and Sierra?
This comparison is drawn from 36 bouts tracked for Badou Jack and 37 bouts tracked for Francisco Sierra. Method and activity splits reflect those bouts only.
Bouts tracked · no edge

Jack36bouts

Sierra37bouts

How They Win ↓

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