I wrote the other day how asking a player their score during a match can sometimes throw them off.
I want to be clear though and point out the obvious: that players with a strong mental toughness will not be thrown off by your question.
Further, IF they are rattled at all - they will recover from it quickly. In other words, they may think about it for a bit, but then they will get it out of their mind and get back to the task at hand: focusing on the table.
Not everyone is distracted with questions. But no reason to test that, right?