6 rounds

Stanley
Ketchel
VS
Philadelphia
Jack O'Brien

Ketchel · TKO 3/6

Jun 9, 1909 · National A.C., Philadelphia, 🇺🇸

Ketchel going in46-4-3

O'Brien going in145-10-24

Confirmation✓✓ two sources

MethodTKO

Round3 of 6

Sources

English Wikipedia
side b · observed 2026-10-11
en.wikipedia.org/wiki/Philadelphia_Jack_O'Brien

✓

English Wikipedia
side a · observed 2026-10-11
en.wikipedia.org/wiki/Stanley_Ketchel

✓