![Historic Boxing on Twitter: "Carlos Monzon retained the WBA world middleweight crown #OnThisDay in 1975 with a Round 5 KO of Gratien Tonna at the Nouvelle Hippodrome in Paris. https://t.co/MBwa8pGo7M" / Twitter Historic Boxing on Twitter: "Carlos Monzon retained the WBA world middleweight crown #OnThisDay in 1975 with a Round 5 KO of Gratien Tonna at the Nouvelle Hippodrome in Paris. https://t.co/MBwa8pGo7M" / Twitter](https://pbs.twimg.com/media/EpGMb94WMEEWwV-.jpg)
Historic Boxing on Twitter: "Carlos Monzon retained the WBA world middleweight crown #OnThisDay in 1975 with a Round 5 KO of Gratien Tonna at the Nouvelle Hippodrome in Paris. https://t.co/MBwa8pGo7M" / Twitter
![Dec. 02, 1975 - The Argentinian boxer Carlos Monzon arrived this morning in Paris from Buenos Aires. On December 13th, he will put his world title in the game against Gratien Tonna, Dec. 02, 1975 - The Argentinian boxer Carlos Monzon arrived this morning in Paris from Buenos Aires. On December 13th, he will put his world title in the game against Gratien Tonna,](https://c8.alamy.com/comp/E1151Y/dec-02-1975-the-argentinian-boxer-carlos-monzon-arrived-this-morning-E1151Y.jpg)
Dec. 02, 1975 - The Argentinian boxer Carlos Monzon arrived this morning in Paris from Buenos Aires. On December 13th, he will put his world title in the game against Gratien Tonna,
![KT_BOXING on Twitter: "#OnThisDay 1975: Carlos Monzon KO 5 Gratien Tonna, Paris. Retains World Middleweight Title. Monzon's 12th successful defence. https://t.co/hiAMTjI9FK" / Twitter KT_BOXING on Twitter: "#OnThisDay 1975: Carlos Monzon KO 5 Gratien Tonna, Paris. Retains World Middleweight Title. Monzon's 12th successful defence. https://t.co/hiAMTjI9FK" / Twitter](https://pbs.twimg.com/media/Czg_UBRWgAA1u_3.jpg)