Rafa has beaten Calleri twice on clay this year, but at least one of those was a really tight match. Calleri beat him last year in... Indian Wells?
I don't know if they have played any other matches. If not, it's 2-1 Rafa.
The Ferrero Gaudio head to head is pretty amusing. It should probably be in Gaudio's favour, but it's not.
I'll take Gaudio and Rafa.