I agree with you on Front's assessment. Let's face it: Roger picked off a couple of his pigeons at the USO in Hewitt and Roddick, an aged Agassi, and two underaged in Djokovic and Murray. It was an opportunistic run. Which means it can happen again. I think you've done a post about this, but IS the USOpen really the hardest to repeat?
Obviously, between the 3 of them, I think it's unfair to call Federer the leader, much less the GOAT. Look at the H2H between them at the USO. Such a shame that Roger and Rafa never got to play against each other there.
See, I wouldn't go the other way and start undermining what Roger
did accomplish. Hewitt and Roddick weren't exactly "pigeons" - they were really good players, but Roger was just much better - so they might have been
his pigeons, but they were still top players back then. And of course you can only beat who you play, so saying Roger "only" beat those guys isn't really a negative, just not a bonus, so to speak.
But where I agree with you is the false equivalency of putting Roger's five consecutive USO titles on a similar level as Rafa's 14 Roland Garros titles or Novak's 10 AO titles. Front didn't necessarily outright say that, but his framing implied it. Roger's five is very, very impressive - but nowhere near on the level of Rafa's dominance at RG. It is a false equivalency, imo.
As for whether the US Open is hardest to repeat, I can't remember what I found, but no player has one
any Slam more than five times in a row - once by Borg, twice by Roger, and once by Rafa. Here's a chart that shows only consecutive Slams win, so we get a visual sense:
Any patterns to discern? Well, looking at the USO the big standout is the fact that no one has won it in consecutive years since Roger's streak - that's a span of 15 tournaments. Does that mean anything? Not necessarily. I mean, of those 15 titles, Rafa and Novak own four each, but just none consecutively. The other 7 are owned by Del Potro, Murray, Cilic, Wawrinka, Thiem, Medvedev, and Alcaraz.
Now it
may be meaningful that so many of the non-Big Three Slams were won at the USO. From 2004 to 2023, the Big Three have won 65 of 79 Slams. Of the other 14, half are at the USO. Again, is that meaningful? Maybe, maybe not. I'd say it is mostly due to Rafa owning Roland Garros, Novak owning the AO (with help from Roger), and Roger and Novak co-owning Wimbledon. Meaning, it might have more to do with their dominance on those three courts than it does the USO being particularly special.
We could ask why Novak or Rafa haven't put together a streak at the USO and might be tempted to say "each other." But that isn't the case - interestingly enough, only once did either end the other's chance at a potential streak, when Novak beat Rafa in 2011. Novak then lost to Andy in 2012, and after Rafa beat Novak in 2013, he didn't play it in 2014 and went out to Fognini in the 3rd round of 2015. Rafa won it in 17 and 19, but lost to Del Potro in the SF in 2018 (retiring down two sets). After Novak won in 2018, he lost to Stan in the 4R of 2018, also retiring. Novak will have a chance to win two in a row this year, of course.
Back to the general picture, here are the number of streaks at each Slam in the Open Era, not counting number of years, just streaks:
AO 13
RG 10
Wimbledon 10
USO 7
Now here are the years that were involved in streaks:
AO 28
RG 29
WIM 31
USO 19
That implies that the USO is a bit harder to repeat, but not enormously so - just enough to make it significant. But again, what does that mean? I'm not sure it means anything. It could be an anomaly, or it could have something to do with being the last Slam of the year.
Is Roger's five-year streak, two longer than anyone else, an impressive feat? Absolutely. Does it automatically make him the USO goat? Not necessarily, in my opinion. He
may be, but again the margin is very slim, with a bunch of guys not far behind - Connors, McEnroe, Sampras, Rafa, and Novak are all close. If Roger is still the Wimbledon GOAT, it is also close with Sampras and Novak very close, and Borg not terribly far off. But Novak's lead at the AO is much larger, and Rafa's absolutely unassailable.