I think that for Felix it clearly is a couple of mechanical things that cause problems for him, and I agree, it's particularly with the ball toss and serve timing. When it clicks, everything goes right, and he just needs to get it sorted so it never loses that timing. I don't think it's mental with him.
With Denis it's 100% between the ears, at this point. Initially he had some problems of his own with serve timing and particularly play at net, and he's come miles in both areas (especially volleys). But some weeks he shows up to a tournament and just isn't in the zone, and once things start to unravel they just come apart completely.
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