ooh - bit of drama in Acapulco! I was looking at the schedule, and saw that Zverev had lost his next match to a walkover.
When I looked into it, turns out he was thrown out during his doubles match after a sweary rant at the umpire, where he also smashed his racquet on the umpire's chair a number of times.
Apparently, footage shows the Umpire 'flinching in fear'.
Oh dear, Sascha. That's not going to do his reputation any good, after he finally seemed to be settling down producing decent results.
Rafa won. So that's good. 
Another early loss for Murray though. Sinner was playing well.