6 rounds

Harry
Mansfield
VS
Frank
Klaus

Klaus · TKO 1/6

May 15, 1909 · National A.C., Philadelphia, 🇺🇸

Mansfield going in—

Klaus going in33-6-9

Confirmation✓ one source

MethodTKO

Round1 of 6

Sources

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

✓