Tennis is an interesting sport. No two players play or think alike, but they all crave the same results: to win.
For that reason, it is a "puzzlement" (King and I) to me why a player of several years refuses to see the logic behind the strategy, I use in doubles which is, to serve everything down the middle on the deuce point, as well as the ad point.
Let me explain by examining how I would play the first point in doubles if I were serving. If this were a new partner, male or female, I would tell them that I would be serving everything down the middle, and anything over their head is theirs. If I were to change, for tactical reasons, I would inform them.
By serving down the middle, when the ball bounces in the deuce court, my partner can readily see that he/she don't have to worry too much about the backhand down the line, and they would likely just hold their position, as the ball is likely to come back through the middle, and towards their forehand.
However,if the ball comes back out of their reach, which could result if the receiver decides to run around the serve down the middle; then, and if the receiver in the deuce court happens to be right-handed and who attempts to hit the return wide, the ball would be coming to the server--my forehand, which gives me a possible opening angle, since the player, who having ran around the forehand to take the serve, would be out of position by being away from their alley for having run around the serve.
Now, as I see it, if I were to serve the ball wide, using a spin serve which pulls my opposing receiver off the court, he has the option of hitting cross court, at the lowest part of the net, or through the middle, since my net man would have to protect the down-the-line shot, and I would have to cover the sharp angle, or a drop shot. Remember, "one good angle deserves another."
But wait you might say: "When serving down the middle in the deuce court, you are serving to your opponent's forehand, if they are right handed. That's true, but a well spun ball would take the service receiver into, and behind their partner, and likely to cause them to make an error--not wanting to hit their partner.
As the server, I must come up fast and wide to cover the sharp angle, or if I'm old, dig up a drop shot at my feet if towards my forehand, or backhand; and if I'm old and slow, this becomes a real challenge if you hope to win. But if it's served down the middle, it's likely to be towards my forehand therefore anything through the middle is likely to be hit as a winner.
That's how see it, what about you?