Why is Federer vs Djokovic popular right now?

Do you know why Federer vs Djokovic is trending on Twitter? Click here, and in your own words, write a short definition and help your fellow Twitterers.
Category: Unspecified | Most recent: June 8 at 14:30 UTC | First appearance: September 10 at 17:35 UTC | Source: Twitter | Permalink

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