Capdeville and Lorenzi are not clay specialists. As for Ruben, he won a 100K HC challenger last year and he has some decent HC wins on his record. He's a clay specialist but he can at least put a performance on HC that is considered passable.
come off it. The highest ranked player he beat in that Challenger was Niels Desein at 179.
Apart from the freak win against Blake in New Haven a few years ago (the match that led to the introduction of round robin imo) I'm guessing this is his biggest hc win
Obviously conditions in Miami are a factor. Probably the closest thing to blue clay on tour.