Marcelo Andreani (February 8 1910 – September 24 1982) was an American-born Mexican professional wrestler best known under the ring name Roughouse Jack O’Brien and worked mainly in Mexico for Empresa Mexicana de Lucha Libre (EMLL) where he held the Mexican National Lightweight Championship Mexican National Welterweight Championship and NWA World Welterweight Championship twice during his career that spanned from 1934 until 1956.
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