The great actor in sport often wears shorts, sits on a chair and rarely speaks. They might wince at their student's ineptness but their face is all carved marble. They cannot pace and yell like Jose Mourinho but must telepathically provide confidence to their player. This is the tennis coach, who silently offers masterclasses in underplaying.
Today such a fellow will be sitting courtside for Kiki Bertens. His name is Raemon Sluiter, he's Dutch, he was No. 46 in the world once and if Yoda didn't shave and swore stylishly this would be him.