Nothing beats Leicester City winning the premier league at 5000-1 odds
Have to say I agree, I don't even follow soccer, but those odds and that story were absolutely mind blowing even if it was just being relayed to me by a sports commentator on a highlights show that comes on in the mornings.
That said, I'd rank Soderling's upset right up there. Not necessarily above Leicester City, but it's above many of the ones mentioned in the OP IMO. As I said, I don't follow soccer so I can't comment on those.
It's above anything to do with college basketball since college basketball is built on upsets. Never really surprised to hear about an upset in the NCAA no matter how big it is.
It's above Vinci def Serena (even as big as that one was), and I can't really comment on the other tennis related upsets like Graf-McNeil and Doohan-Becker since I didn't know enough about the circumstances of the time, but in my biased opinion, Nadal-Soderling will likely remain forever in my mind as the greatest tennis upset that I ever witnessed hands down. Unless someone else comes along and wins 11 RG (and maybe counting) I will never consider another upset as big as that one. And that's the beauty of that upset. At the time it was still huge even though Nadal had only 4 RG titles, and it's gotten significantly bigger in hindsight. It's like it created a massive earthquake so huge that the aftershock is still being felt today with every RG title that Nadal wins. Not only that, Federer will remain on 1 RG title forever. In fact the only potential bigger story than Soderling def Nadal would be if Federer won RG this year, lol.
It's bigger than Giants def Patriots, and I don't say that lightly because I loved that upset. The Patriots were 18-0 and I don't think anybody really thought they would lose, but the Giants had played them to a very close 38-35 score at the end of the regular season, and they had a few other hiccups in the regular season as well even though they won those games. They were down 10 starting the 4th to the Colts, and I believe Baltimore and Philadelphia were the other teams that came close to beating them.
It's bigger than Cavs def Warriors. Not much to say here. Cavs were definitely underdogs, but any team with Lebron on it always has a shot. Cavs def Warriors could probably be taken off this list in favour of something else. I see Doohan-Becker has been suggested so I won't say that again, and forgive my North American centric view here, but what about something like the 2004 ALCS. Teams were evenly matched on paper of course, but the Sox were down 3-0 and to make a long story short, anyone who knows the full history of the Sox knows how huge that was. I did, and I'm not even a Red Sox fan.
And it's above anything golf or UFC related, no questions asked.
The others are debatable. So Soderling def Nadal is in that top tier IMO. Right there with the Miracle on Ice, Leicester City, and Douglas def Tyson.