Del Potro's injury isn't comparable to Soderling's sickness. Soderling had mono which is a kissing disease.
You act as if he was born with that virus infection. Chances are he could have prevented it, but he didn't. With this rational, people would say, "Federer is quite unlucky, if he didn't have mono, he'd have more slams by now".
Your ignorance is staggering.
So you actually blame Söderling for getting mono? An infection that hits a majority of people in fact, the only difference being how individuals' bodies manage to cope with the effects of it, which are HUGE?
How about googling 'Ancic, Mario', just for starters?