Thinking entrepreneurially, building projects.
I develop projects at the intersection of strategy, identity, and execution. What drives me is not only thinking through ideas, but building them with substance, responsibility, and a clear standard.
Projects built with purpose and responsibility.
To me, entrepreneurship means taking responsibility, creating structures, and building ideas with a long-term perspective. What motivates me is not just developing new concepts, but turning them into real projects with substance.
I am especially drawn to ventures that are not arbitrary, but rooted in identity, relevance, and real value. That is exactly how the two projects featured on this page came to life: Close Call Clothing and UServe.
Close Call Clothing
Close Call Clothing was born from the desire to carry the feeling of tennis beyond the court.
Tennis is individuality, precision, and mental strength. Every player develops their own style, their own presence, and their own way of handling pressure. And yet there is something fundamental that unites the sport: the same challenges, the same inner battles, the same moments between control and risk.
Close Call Clothing translates exactly that into streetwear — for people who identify with tennis not only in the game, but in their mindset.
We bring tennis identity to the street and build a community of players who truly love and live the sport.
The first dedicated tennis streetwear brand. A brand that does not reference tennis, but lives it.
Quality as the foundation, transparency as the standard, limited drops, and intentional production.
UServe
Taking the next step together — with personal experience, real proximity, and support around college tennis in the United States.
Starting at Mississippi State University, I later transferred to the University of North Florida, where I completed both my bachelor’s and master’s degrees. My time as a college tennis player was one of the most formative and meaningful chapters of my life.
But especially during my recruiting process, I often wished I had someone by my side to support and guide me. That is exactly why I made it my mission to help young tennis players turn the dream of college tennis into reality. I look forward to helping you reach your athletic as well as academic goals.
Taking the next step together!
We want to pass on the experience we gained ourselves as college tennis players in the United States. It is important to us to support you in every athletic aspect of college tennis. Our expertise will remain available to you even after a successful placement. We are happy to answer your questions about tournament planning, athletic training, and the transition to professional tennis. Our doors — and our knowledge — are always open to you.
What should I study? Which courses should I take? Will my degree be recognized in Germany? Do I have to start right after high school? These are exactly the questions we asked ourselves before and during our college experience. We support you in choosing the right academic path and course schedule, and we help answer all relevant questions about the academic side of studying in the United States. You can always rely on our guidance.
New experiences come with a lot of unfamiliar situations and challenges. Whenever you have personal questions or concerns, we are here for you — before you go to college, while you are there, and even after you return home. We have lived through the process of moving away for the first time, adapting to a new environment, and meeting new people and cultures. We are always ready to listen and to share our own concerns, challenges, and how we ultimately handled them.
For projects, brands, and collaboration.
I welcome conversations around entrepreneurial projects, brand building, and strategic collaboration.
hello@jonas-pelle-hartenstein.de