Well, there was a very funny situation before the Ovtcharov's match with Elias Ranefur. I haven't seen it as I wasn't in the training hall, but my friends described it to me.
Dima was training with Boyan Tokic while Ranefur trained with Quadri Aruna. The Swedish started practicing his backhand services, but several times hi did them with posture just like Dima uses. Several minutes later Ovtcharov asked Ranefur did he imitate him
We know what happened next and what success the Swedish had with those backhand serves.