The bent/bent configuration on the two-handed backhand is rare amongst men and much more common with women. However, I think Ivanisevic (see attached images) must have been pretty influential. The trend seems to be that Eastern European men employ the bent/bent configuration on the two-handed backhand. Check out the videos of these guys. Also notice the attached images of Hernych, Tursunov, and Stepanek. Berdych and Safin tend to be more versatily in their hitting arm combinations. From what I've seen of Karol Beck he always hit with a bent/straight configuration (see last image).
Cilic:
Djokovic:
Davydenko:
Hrbaty:
Ancic:
Novak:
Cilic:
Djokovic:
Davydenko:
Hrbaty:
Ancic:
Novak:
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