玉突き	52707
玉突	761
球撞き	6472
たまつき	1192
玉つき	4707
Daijr used 玉つき in an explanation.

@@ -9,0 +10,6 @@
+<keb>球撞き</keb>
+</k_ele>
+<k_ele>
+<keb>玉つき</keb>
+</k_ele>
+<k_ele>
@@ -12,3 +17,0 @@
-</k_ele>
-<k_ele>
-<keb>球撞き</keb>

If the intended meaning was "esp in professional 
billiards", wouldn't there have to be a particle like で 
after "特に、プロの玉突き"?
_
Either way it doesn't seem to be very common, I've 
attempted to find sentences of it being used like this 
but I don't come up with many examples where it is 
obviously referring to the player rather than the game. I 
did check with a native speaker who agreed it could refer 
to the player though, but...

Sorry if I'm being thick, but that definition in Daijisen's entry for ハスラー :"３勝負師。賭博師。特に、プロの玉突き。" reads to me as: "gambler, gamester. Esp in professional billiards".
I don't get from it that 玉突き means a billiard player.

the definition in daijr is "特に、プロの玉突き。" but it 
refers to a professional pool player, not professional 
pool. 
_
jawiki, ngrams 球撞き	6472

@@ -11,0 +12,3 @@
+</k_ele>
+<k_ele>
+<keb>球撞き</keb>