Founder and Head Coach of the Tennisbase Schießl & Sieber based in Straubing, Germany
- The Academy with five coaches is suited for beginner, performance and high performance lessons
- On Social Media the tennisbase has over 180k followers on TikTok, Instagram and Youtube

2019-to-date
Coach of Peter Heller (Career High ATP high ranking in singles no.271), Jeroen Vanneste (Career High ATP ranking in singles no.314), Angelina Cerdic (German Junior ranking no. 2, U12) and many local performance players, top 100 in the men's singles German ranking

- One of the leading social media tennis influencer worldwide

DTB A Trainer
DTB B Trainer
DTB C Trainer

Tennis Integrity Protection Programme (TIPP) by TIU

Marc Sieber

Email: sieber.tennis@yahoo.de / tennisbase@schiessl-sieber.de