Natascha Ragosina

Natalia Yurievna Ragozina , better known as Natascha Ragosina, is an undefeated retired professional boxer who spent much of her career ranked as the top female super middleweight in the world. Though born in Kazakhstan and currently residing in Moscow, she competed professionally for Russia and is of Russian descent. She is the longest reigning WBA female super middleweight champion and WBC female super middleweight champion. At the time of her retirement, she held all major female super middleweight titles and two heavyweight belts

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Source: Wikipedia