Juan Carlos Ferrero used to coach Alexander Zverev and but it wasn't a very good time for either as they simply could not get on the same page.
Ferrero is a former world number one who was hoping to take Zverev to the next level making him the number one. It lasted for a few months but after that, they elected to part ways because they could not agree on how to play tennis:
"Working with Sascha (Zverev) that wasn’t that easy for me, it’s not the same culture, he understands a little bit differently (the meaning of) being professional. I needed to refresh a little bit and work with someone that was a little bit the same character as me and wanted the same things for the future and in Carlos I think I found it."
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Ferrero then went on to coach Carlos Alcaraz who proved to be a super talent well worth of the hype. Ferrero led him to the number one spot he envisioned for Zverev because they clicked right away:
"He’s my second player as a coach and I think I keep learning from him and he’s learning from me. We’re both together growing up at the same time. He’s a very nice guy and it’s very easy to work with him.