Yeah, winning the French isn't really that big of a test of athleticism in my book. I think it's more of a test of endurance.
During Sampras' career Chang won the French, Agassi won the French, Courier won it twice. Are any of them better athletes than Sampras? I don't think any of them are, yet they all won the French and he didn't. No one who won the French during Sampras' entire career I thought was a better athlete than him, but they all won the French and he didn't.
Shelton I don't think will ever come close to winning the French, but at the same time I think there's probably only a handful of guys playing today who are as good an athlete as he is, or better. Off the top of my head, Alcaraz is probably a better athlete than him, and maybe a few others.
It's one of those hard things to explain or put into words. I just look at him play and think I've never seen anybody play tennis better than he did.
The highlight reels...
He's the first player that I saw from the start of his career to the finish and I was amazed by him when I first saw him play when he was 18. Before Sampras I guess I would say McEnroe I thought was the greatest tennis player ever, but that immediately changed I guess in 1990. McEnroe was great, but Sampras was the next level to me.
Even when Federer beat Sampras at Wimbledon I didn't think Federer was a better athlete than Sampras. I just thought he played better and beat him on that day, age differences aside. And of course Federer won more, but I still think Sampras was the better athlete.
Overall there is really no boxes I can check that says I think this person is a better athlete than that person, it's just merely an eye test for me.