What's bigger?

[lilminihorse]

Phelps winning 8 medals and breaking a ton of records or
winning the grand slam in tennis??

Honestly tennis fans, I gotta go with phelps on this one. this dude is amazing; I know winning the grand slam is damn near impossible but this dude is doing the impossible

[P-Town Tennis]

The 100m butterfly was one of the most amazing things I've ever seen. To win by 1/100th of a second is just mind blowing.

[lovecr717]

Phelps winning 8 medals and breaking a ton of records

[Nuke]

There's a bit of luck involved in winning 8 swimming gold medals: you have to be lucky enough to be from a country that has enough other good swimmers that the relay races are possible.

[albino smurf]

Winning all four Opens is the same as Phelps doing great in swimming and track.