His latest, greatest photograph has him jumping on a hidden trampoline and playing air guitar on the strings on his tennis racquet. For a guy who missed six months because he got hurt giving his kids a bath, it seems like a wise frivolity. The pic was taken in promotion for the Ryder Cup-like tournament he’s spearheading – the Laver Cup – and also, presumably, an upcoming announcement that he’s leaving tennis to focus on his music career.