Ok, so they're not, but that doesn't make it any less hilarious.
From the yelps, it's definitely Maria Sharapova they're watching, but we're unable to confirm who she's screaming at.
All they need is some strawberries and cream and unrealistic expectations for average British players and they'll be true fans.
The cats, called the Ninja Kittens by their owner, apparently, er, "studied martial arts, learned how to run, climb, stalk, attack, and now began preparations for the flight to Mars!"
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Good for them.