This is tough to pick a specific matchup.
Guys I like to watch Haas, Wawrinka, Almagro, Gasquet, Fognini, Llodra, Djokovic (except vs Nadal and Murray), Tsonga (grass only), Kohli, Youzhny, Dolgopolov, Paire (on clay), Dmitrov, Robredo, Malisse
Guys I don't much care to watch Nadal, Murray, (especially against each other and Djokovic), Del Potro, Ferrer, Isner,
Guys I'm indifferent to Federer, Berdych, Simon, Raonic (losing interest fast!), Cilic, Janowicz, Gulbis
Guys I really don't want to watch ever Nishikori, Querrey, Anderson
So, I suppose a mix of the guys I like to watch is all good. But like all, I do like Haas-Fed.