Apparently this is a bit old since Roger now has 15 titles, but tis beautifully done.
I found it via the Datavis tumblr, which credits the work to David Potsiadlo. David's site also contains this timeline of tennis champions:
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Earlier:
Federer's Streak
Federer as Religious Experience
Wimbledon Match Visuals
The longest tennis rally in history: 643 shots
