The scheduling today could be a nightmare. I can't see this match being over in the next couple of hours- and the Krejikova/Sabalenka match could also be a long one, though Barbora has been in all 3 tournaments (til dropping the mixed) she might be a bit more tired. That's before Jannik and Andrey even think about warming up.
It's obvious (to people who think ) that the matches will potentially get longer as the tournament progresses and the standard gets higher, and the opponents are more evenly matched (in theory) surely?
So much for the extra day, Craig Tiley- back to the scheduling drawing board.