6 rounds

John
Riggins
VS
Thad
Spencer

Spencer · UD 6/6

May 4, 1961 · Spokane Coliseum, Spokane, Washington

Riggins going in—

Spencer going in5-0-0

Confirmation✓ one source

MethodUD

Round6 of 6

Sources

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

✓