While I don’t agree that it’s 100% a different game (like tennis versus golf -not what you were suggesting I know), nor do I think you can ignore the need for endurance when assessing if something is more difficult or not (singles is definitely harder if for no other reason you need to be fit to play)....I think the other points you make are spot on. And perhaps that is what is leading to some of the disagreements on the board.
At a more advanced level—not sure what that level is exactly (4.0, 4.5, certainly 5.0)—I think it is a fairly easy transition to move to doubles and be successful for someone that is a high level singles player. Yes, it will take some time to get used to the nuances and certain shots you are not as accustomed to hitting...but a high level singles player will have the strokes to do it. For someone who only plays or principally plays doubles it would be very difficult if not impossible to move to high level single and be successful. Aside from the reason they focus on doubles is likely fitness/endurance related already, the shots needed to be hit on the move, consistency of rally’s as well as it just being a bit of a different game is. Doubles specialists at the pro level are that because they couldn’t make it in high level singles or they are past their singles prime and have chosen to focus on doubles.
What does occur to me is that a beginner or intermediate player that has played only singles..when they step on to a doubles court they will likely look out of place until they learn the game and/or develop their strokes. They likely won’t have the return precision, perhaps the net game, positioning/communication, ability to get into a flow with the shorter points, starts and stops, less serve reps....as well as the nerves of having a partner to support many have discussed.
Perhaps that is why there is so much disagreement here?
My case has always been there are nuances and complexities to both. For singles, yes that includes but is not limited to endurance/fitness, for doubles there is the partner/team element and other strategies that develop the more you play. In the end the best singles players will also be the best doubles players (at a certain level). As I love hypothetical arguments that I can’t be proven wrong in...I’m going to say that if the singles game was eliminated 10 years ago and all tennis pros played were doubles. The top 50 would be about 95% of the singles players. Though there may be a rare exception of players that were just so skillful at the doubles game (Leander Paes who may be the quickest net player ever, the Bryan Brothers, Lisa Raymond—-that could possibly break top 50..and the flip side of a few singles players where the game doesn’t translate at as high a level).
If we include endurance, then there isn't even a contest. I also don't agree that the top 50 would be 95% dominated by singles players, unless we're looking at the top 1000 ATP, though many top doubles players could easily fall into that category. What you need for doubles are primarily the serve, return, and volley. The importance of groundstrokes, movement, and general fitness are drastically reduced. For a LOT of singles players, that just guts the only reason that they're good. Djokovic, Nadal, and obviously Federer would still be fine, but Nishikori? Sure, the top 100 can learn to improve and hit better volleys, but I feel like there's still a good chunk of doubles players that can still stay relevant due to their ability to hit solid returns and volleys. For sure though, a good chunk of the top 50 would be taken up by singles players who already were capable of playing the net and having a good serve/volley or singles players who could learn to improve the needed skills to the level necessary and aren't relying on their movement and fitness to be a strong player.
The level will be the one where your serve starts to be a weapon. As soon as that happens, it makes everything easier for a quick net player regardless of his skills.
More so the level where the serve can consistently be placed and the net player can consistently finish easy shots and first volleys. Unless your serve is able to score a service winner off of half your serves, the easier service game to hold tends to be the one with the weak server with an strong net man rather than the strong server with a weak net man.
Same exact thing holds true in singles. The strongest service games are those with a good serve to set up, followed by a strong first forehand/volley to take control of the point. It's not the ones where the guy hits a big serve then does the minimum with the sitter first ball.
Disagree.
In doubles, you have to figure out the strengths, weaknesses, tendencies of twice as many opponents. You also have to notice and compensate for your partners tendencies.
I play differently when I have different types of partners, for example. And I have to also figure out what to do with two different opponents, who usually hit the ball differently from one another. And you have to do this when you are touching the ball half as much as in singles.
And you have to make tradeoffs because of your partner. Like, say partner is alley camping And is bad at net. Best serve for me is out wide, which places partner closer to where she should be. But that is opponents lethal FH, which will be tough for me because of the angle On the return. But maybe if I S&V, I can reach the wide return. In singles, it’s easier — just don’t serve to the lethal FH.
If you’ve never left a doubles match mentally exhausted, you’re missing a lot in your matches.
Maybe you could communicate with your partner that if they don't wanna be at net, to not put them there. Change your strategy and play two back and serve to the returner's backhand. If they want to get better, tell them where to stand and let them have practice at that volley all day.
In the end, this argument seems pretty exclusive to lower level doubles. Then we come down to whether we should limit ourselves to lower level rec doubles, the most played form of doubles, or to high level competitive doubles. Yes, there is some level of adaptation to your partner and your opponents, but there are still plays that are good regardless of your partner and opponents. Maybe the amount of difficulty to execute will shift if your partner has a better/worse serve/return/volley, but the playbook should remain mostly unchanged and you should be continuing on with mostly the same plays.
As i said, our disagreement could be because of the difference in levels. I don't play differently no matter who I'm playing with or who I'm against. There is an optimal way to play doubles, and if you're good enough then everyone is playing the same way.
I don't exactly understand your example. Your partner is alley camping AND bad at the net yet you can place your serve consistently and your opponent has a lethal forehand? Is your partner on a lower level playing up?
I'm not leaving mentally exhausted because doubles isn't chess. The strategy is fairly simple and everyone knows it. Executing it can be very difficult, but the strategy is very straightforward.
I think a solid number of low level servers can place a serve consistently. The lethal forehand can easily be lethal relative to the level, but everything else they have is terrible, or effectively nonexistent in other words.
Execution isn't all that difficult in my opinion (at least relative to singles). Yes, returns are a bit harder, but almost everything else is easier because you are already in position before the opponent hits the ball, or your partner is in position to clean up before your ball is on your opponent's racket. Yeah, defense is harder, but you're realistically not meant to win a large percentage of those points. You just do your best to stay in the point and pray for a gift and move on.