Marius
International Debutant
A number of guys have had good "second comings" if you can call it that, especially Australians.Rudolph was always in and there abouts with the NAT. The problem was his inability to step up to the next level. That was 6-7 years ago so who knows now.
Langer, martyn, Hayden to name a few. And McKenzie had a pretty decwent second stab at Test cricket if you are looking for a Saffa.
So, I think Rudoplh could definitely make a go at a successful test career again.