Re: Worst matchup issues between top (10/20) players
Two more that seem interesting....
Hewitt/Karlovic. Karlovic leads the H2H despite being basically all-serve, and Hewitt had one of the best return games on the tour, matching up very well with other S&V players.
Federer/Murray. Particularly given Fed usually owns Muzza at Slams.
RIP Henry Chinaski. A true MTF legend