It's been extremely windy there so players with higher ball tosses may well have a lot more double faults. And there's a real technique to serving in wind which maybe he hasn't really learnt
But I think that yesterday he had none. Which may mean it's just up and down. Or that it was less windy yesterday.
If the second serve is aggressive, I don't have much problem with quite a few doubles faults. But 11 does seem rather a lot !
Come on, Oli !
Would love him to take this form into at least 2 weeks of Qatar, picking up enough points to break 400! For someone who, perhaps, might have been a little over-confident in his abilities, to have a very difficult year (2 1-2 month injuries and a real lack of form, plus seeing the likes of Vesely and Thiem excel) yet seemingly not giving up and starting to come through it post hernia op is very pleasing. i wish him well.