Well, they both were struggling with their serves really, but LYD more so. This is perhaps their biggest weakness at the moment, they are conceding so many points off the serve it's like having a handicap. It's difficult to be sure but I suspect LYD may be a little too conservative on the contact height of his low serve. YYS seems to be getting better but still not quite consistent enough. I’ve always considered there to be two main types of serves (for the low serve), one which is slightly deceptive, difficult to read/anticipate, making the receiver a fraction slower to react but sacrifices a little bit of consistency in doing so. This doesn’t need to be as tight to the net or have the absolute perfect trajectory as the receiver is a little slower to meet the shuttle so is often played with a little more margin (but only very slightly). Someone like KSS would fall into this category for me. The other type is the conventional serve that is far easier to read and relies on being tight to the net and have the perfect trajectory every time to prevent being attacked. This is the category where I would place LYD’s serve. He has a more “honest” looking serve that he must get millimetre perfect both in terms of trajectory and tightness to the net. But the new service height rule has played havoc on this as there is no room for error with this type of serve. This places even more pressure on his serve than before and causes him to make errors. So to counteract this he has been serving more flicks not just to keep his opponents guessing (as there’s no point given his serves are relatively easy to read) but to take the pressure off his low serve. I think the only way he can improve on this is to make adjustments to his service action and where he serves from as no matter how many times he practices his current serve, it won’t be under the same high pressure conditions as a real match. He needs something reliable under pressure that will deliver the shuttle consistently below tape height as the receiver contacts it. I think he should develop a newer less readable serve and experiment with serving from slightly different positions.