Assuming it's a mental issue, you need to meditate on those shots. Trying to deal with them as if they were regular shots won't help IMHO, it's the winning ball we're talking about.
It's like bringing in your "mind camera" the position you need to bring the CB in every shot, and then actually recreate it.
Prepare yourself about those issues in a similar way, you need to "see" the situation inside your mind first and deal with it, imagine your self dealing with the pressure, "see" the whole match to the end, and then just do it.
Please excuse my English, tried to explain it as best as I could.
All the best,
Petros
It's like bringing in your "mind camera" the position you need to bring the CB in every shot, and then actually recreate it.
Prepare yourself about those issues in a similar way, you need to "see" the situation inside your mind first and deal with it, imagine your self dealing with the pressure, "see" the whole match to the end, and then just do it.
Please excuse my English, tried to explain it as best as I could.
All the best,
Petros