That’s New Zealand table tennis pro Matt Hetherington using a Samsung Galaxy Note 3 paddle as a paddle. According to the YouTube video Hetherington uploaded, he took the battery out of the phone before slapping a few winners.
From what I can see on his IG account, Matt is like the Dan Bilzerian of the ping pong community. Guns, Samsung Galaxy paddle, couple shots of girls and pics from a Vegas trip.
So you know the Galaxy has the 5.7″ corner to corner screen. A regulation ping pong paddle is six inches wide and 10 inches from the bottom of the handle to the top.
In other words, Samsung should just figure out a way to get into the paddle business.