Russian tennis player Pavel Kotov was the talk of the tennis world Sunday, but not for his five-set victory over Arthur Rinderknech. During one part of his first-round Australian Open match, as Kotov appeared upset with how the contest was going, he erupted on the court, according to the New York Post. The Russian whacked a tennis ball against the wall behind him. https://youtu.be/kdZIaYum0ks?si=-Qrf3f32hSN9qufX The tantrum stunned a ball girl who is shown on video at first appearing to be frozen by what was happening before she turned her face away in fear. The ball struck the wall several fe…