Iga Swiatek was in no mood to discuss taking a break from tennis following her US Open exit on Wednesday ... getting into a heated exchange with a reporter who suggested she needed to regroup.
Swiatek was fielding questions from the media after losing to Amanda Anisimova ... when she was asked, "how tired are you at the moment?"
Based on her reaction ... the 24-year-old wasn't the biggest fan of the question -- saying "Well, I don't know, it's not like my matches were exhausting here.