Pro-level captain of the German U-17 team and Tezuka's personal coach, known as the "Philosopher of Victory". Despite being only 17, Volk is considered one of the greatest up and coming pros in today's tennis world, so much so that almost everyone knows his face and name. Like Tezuka, he's taciturn, disciplined, and strict. He points out flaws in posture and character for his teammates in the middle of matches, and even offers constructive criticism or praise for his opponents where appropriate. Though he clearly holds a lot of pride in his team, he is modest, calm, and never assumes his victory is assured. He is also able to use the Whirlpool Baptism, a shot with a powerful vortex spin that forcibly spins a racket out of a player's grip. Volk rarely uses this move though, as he believes reliance on such techniques makes for a weaker tennis player.