Question

The first american to reach top-rank male sabre fencer status at the international level grew up in what ny borough?

Answer 1

The first american to reach top rank male sabre fencer was Keeth Smart and he grew up in Flatbush, Brooklyn, New York.  Hope this helped :)

Answer 2

I believe the answer is: Keeth Smart 

Keeth Smart  gained the status as top-rank male sabre fencer during the International sabre champinship in 2003.
Prior to this, the majority of top ranked sabre fencer was dominated by athletes from western european nations, notably french and italy.