OKAY ITS OFFICIAL MY DAD JUST ASKED @rogerfederer IF TENNIS BALLS ARE YELLOW OR GREEN AND HE SAID THEY ARE YELLOW pic.twitter.com/EXdXRr0oFa

— Delaney Dold (@delaneyanndold) March 19, 2018

What color is a tennis ball? Green or yellow? https://t.co/6UdE3mNMwA pic.twitter.com/YeEfTFPm1D

— Scripps National (@ScrippsNational) March 21, 2018