#74 Sijsling and #79 Bedene are the only players in the top 100 I have never seen.
Update: I finally watched both of them for the first time on TV at RG.
The highest right now is #73 Donskoy.
Klizan is the player I never watched as well. I don't know how he got so high in the rankings, gonna try to watch him at least once in the near future.
You didn't see him play against Rafa in the 2nd Round of RG 2 weeks ago? He won the 1st set. He also beat Tsonga in the 2nd Round of USO last year.