Recently I play this new guy. As a practice game or recreational game/set. When a shot is out, should he call it instead of using his finger to point out. I have hard time to keep up to see him, if I make a deep shot and I have to watch him first and then his return shot next in a quick seconds. A few times I chased down a shot and hit a good return or winner and to realize that my previous shot was out. He did not call or shout out but did raise and point using his index finger while I am paying more attention to his return shot. It was a waste of energy to fight and run down for a previous bad shot. Another time, I hit deep to the Baseline and he dropshot me right over the net to my side. I took a glance at him, no call, no finger and turn my eyes to his dropshot and to know I have to time to retrieve the shot by a second. These whole game was like, whenever I make a deep shot, I have to look at him if he make any out signal then to his return shot. Should a recreational tennis or League tennis be like this. I did watched a few League's Matches and some players did the same thing. Using finger instead of call (verbal) out. Is this allow in a Match?