ITF singles ranking 40+ : 606
2023
GPTCA B-Level International Coach
2022
GPTCA C-Level International Coach
2020
ITF Academy Qualifications
2014
DTB Referee
2013
USTA diploma trainer
1996
VDT Coach
1995
DTB Tennis Coach
Academic
Master of Business Administration (Accounting & Controlling)
Holger Zöller
Email: office_FZ-ProSport@freenet.de
