A few days ago, when Grigor Dimitrov beat Milos Raonic, the stat that was making the rounds was this: Dimitrov had managed to win all 26 points played on his first serve. What was my first reaction? Make fun of Milos Raonic, one of the worst returners of serve on the ATP. The Canadian is, after all, the man who failed to break Juan Mónaco’s serve over five sets at Roland Garros last year (think about that “feat” for a second. #neverforget). However, when Dimitrov rolled over Jürgen Melzer and lost just six of the 39 points played on his first serve – 85% – I started wondering if the Bulgarian’s incredible serving stats were not so much a result of facing poor returners, but of an improvement in his serve.