He is the tennis coach of the number one German player, Anna-Lena Grönefeld, of who is an outstanding top twenty doubles and singles player, in mixed doubles, womens'doubles and womens' singles.
He is the tennis coach of the number one German player-Lena Grönefeld. Lena Grönefeld is womens'doubles. Lena Grönefeld is womens' singles. This was of who is an outstanding top twenty doubles and singles player. This was in mixed doubles. Anna is the number one German player.