Jane I read about his scan. He's been very 'Rafa' about things- that his health is the most important thing, and he won't do anything to jeopardise that.
Sebastian did look worried sick.
He's been on the other side of matches, as the loser, where the opponent has then withdrawn the next match. Steve Darcis springs to mind, at Wimbledon.
Even the tour finals has had Federer withdraw before the final (Djok then won by a walkover).
I'm going to miss a lot today, meetings at DD2s school. All at the wrong time 
Fingers crossed for Halep and Jabeur- although really, If Rybakina and Maria get through, they've played well to get there.