Pliskova appointed Vallverdu and also added Olga Savchuk to her coaching team in November 2019 after splitting with Conchita Martinez but did not... ...
https://www.hindustantimes.com/tennis/pliskova-splits-with-coach-vallverdu-ahead-of-new-season/story-KdwdW8OnSigURpN25Z0rcP.html