There are a few things that some players who do not understand or do well in doubles that set me off worse than a firecracker.
Serving.
Ideally, 80 percent of serves ought to be short under spin or dead very low and stay between center of court to center line. This minimizes possible flip angles, makes it tough to flip, and gives partner a ball to attack or place short or deep.
Server needs to be able to make it heavy when they want... there is no variation to fool anyone if their best under spin serve is weak.
Some players simply kill me by failing to keep ball short or low. Many think it is a great idea to serve ball going past sideline... that gets killed at wide angle no chance.
Players who have depth or placement variation in singles can get away with a weak spin serve, but weak spin suck in serving for doubles if it is always weak. A good receiver loves a weak ball high at any depth. There is little fooling on short placement as there is half the court to work with and pretty much fixed serve position...
That is why it is important to mostly serve low and tight towards center line. That is a tough ball to attack and when you add variation of spin, even a safe receive is an error or chance to attack. Then, when you do make a quick deep serve near end line, those serves are a surprise and get points or setups.
A partner should not be pushing away points or opportunity for advantage on serve. Partners who do not serve effectively are a severe liability to the team.
It doesn't take much to learn a medium under spin serve low and tight and learn a low and tight light sound or dead ball... but you will be surprised at the number of 2000 level singles heros who cannot serve effectively in doubles to save their life.
As a very offensive minded player, I should get a minimum of 5 attacking chances per game from my partner on his serve... he will serve an average of 8 times or more. if I only get 1 or 2 or zero chances to attack per game and am always under attack from 2nd ball, my partner gunna hear it from me as I choke him out.
I have 1600 level players who can serve right half the time and not give away points who can place the ball if they dont attack... this kind of player functions 10x better in doubles than 2000+ level singles superstars.
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I agree on the whole but there are other ways to vary. I like to add just the right amount of sidespin to make it awkward for the opponent to judge : wide armed gesture suggests strong sidespin and they get ready for a strong flip, but it's still mostly underspin (low, slow and in for a second bounce, as you said this is crucial) so that a lot of players halt half way for a split second, then they either still go for a weak/out of coordination flip which often finds the net, or else a long or high push that's easy to attack for your team-mate.
Depending on the receiver, even low and short tomahawk serves can be deadly.
And then, yes, long or wide serves can be a weapon. There's tons of different styles on the receiving end of the table, and if your team-mate is a teenager quick on his feet they may prefer open play (depending on the type of opposition). But we can all agree with the bottom of what you are saying, which is, don't do things randomly - there's your partner who is going to receive the next shot.
Even on the mental side, you have to think as a team, not weigh down the atmosphere for half a set because you missed a serve. When you see, at all levels, pairs of players who play as if they'd give their skins for each other, the coordination, general alchemy and success go up the roof right away. You can't just plan for every move, but at some point you start to think, play and... feel as a single unit - always aware of where your partner is - and it becomes intuitive what the scenario for this or that point should turn into, as if you were planning as one. Sounds like I am going metaphysical, but ask the Karlssons (Falck) about it, or when Xu Xin played with Yang Haeun. Of course, it takes practice and competitive games as well and I am not saying it is possible with every partner. Just don't only think about your woolly self.