Tennis balls are supposed to bounce. So what happened to this ball during a match at the Australian Open? A very likely explanation is that the surface layer had a vapor bubble underneath, so the kinetic energy of the ball went into deforming the surface https://t.co/VWiV89G2Tw pic.twitter.com/fqL6krHXfu
— Massimo (@Rainmaker1973) August 4, 2019