Unfortunately there are some people out there with really bad vision who regularly play "out" serves and it leads to lots of confusion, especially if the server knows it's out. At the end of the day it is the returners call so best to just play out the point but yeah it can get ugly. I've watched the service line during other's matches and it's amazing how many "out" serves people actually do play as in. I try to play on clay as much as possible, that way you just check the mark.
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