I do not recall ever receiving or giving out a double bagel in doubles. If the first set ended in a bagel in social doubles, we usually switch partners to make the matchup more even. If it is a USTA league match, very rarely do both players on the winning team have enough focus/intensity to not lose a single game. If a team is truly dominant in a USTA league doubles match, they would probably try to sandbag and lose some games to prevent being bumped up.
The only scenario where I can imagine a double bagel in doubles is in a tournament.
Lol, lucky you))
Of course in a tournament. We played against two ladies that have been playing together for 25 years. We played them last year (with a different partner) with the same result, but I was injured, and I was attacked a lot. This time it was our second match of the day as we had to cancel couple matches the previous week and that was the last day that we had to complete our matches, so I guess we were not really all there, just wanted to be done with it after so many matches in one week. We expected to lose anyway, but were hoping to get maybe a game lol. The first match we actually won, but it was our best chance for a win in that tournament from the very start. We lost 5 out of 6 matches in a RR format. The team we lost against went on to win the final, the team we lost the day before 0-6 1-6 were the finalists. We played better against everyone else. Our top teams have lot of experience in doubles and often with a fixed partner for many years, I think it counts a lot.
The system here is a little bit different. It's pretty much open especially the internal tournaments. They can separate R9-R6 and R5-R1 in the open tournaments and by age, but there is again a range. Under 30s are in the "Active" category. Then 30-45, 45-65 and then older. But it depends on a competition. Interclubs have "Active" teams, and 30+, the cups can be completely mixed. When a player first get their license they always start from the bottom and play whoever is available within certain limits to work their way up. If you are R9 but the rest of the field is at least R8 you will have to play against R8. There are no separate competitions just for a certain level as far as I know.
Our team have players from R9 to R6. R6 has to play the highest ranked opponents whatever they are. R9 will play the lowest ranked opponents. Which can be another R9, but not always and it may not be a true R9. But this is how it goes... We have 8 players, but there are 4 singles and 2 doubles matches in a fixture so 4 players are enough if only 4 can play on a given day. I have no idea how doubles are formed. There are probably some rules like when you guys have your 8 teams with 3.5 and 4.5 combined, but they are not set in stone. Only singles results count towards ranking, but in a team competition it's possible to be relegated to a lower league. Which doesn't mean that players in the teams in that league will necessarily be lower ranked. It's all for fun anyway so nobody is stressing. As a child it took me a year of competing to be able to lose in 3, not in straights, and this is was when I was taking things more seriously even that I never wanted a sports career, I just loved playing and of course winning felt nice but it took time. Getting upset now? lol. I had a mixed double partner who was very good and we got to the final of one tournament last year, but I don't want to play with him now as he gets too stressed as if he would lose his last cow not just a stupid match in a stupid tournament with two cans of balls and a bottle of wine as a prize.
I find doubles quite difficult, I haven't played a lot, only started playing doubles more or less regularly in the last 3-4 years. But formations etc. are a mystery to me, probably need to read a book lol. Singles are easier in comparison, one opponent and all court in front of you to use, what's not to love, just be fit, try to hit a clean ball, and don't try to do too much too soon. Doubles need more concentration and since we play a lot straight after work it can be difficult. Singles are liberating, the moment I start moving my head clears. It's like a rest only a physical one, and no-one gets upset with the result.