Ever wondered what colour tennis balls really are?
Well, according to tennis legend Roger Federer, they're yellow!
Jonathan Fairbairn takes us through this and other stories currently trending on social media.
if roger says they're yellow, theyr yellow 😂😂 pic.twitter.com/anh3Hb8tWl— n a r e l l e 🌹RF (@ensquaredx2) March 19, 2018
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