Heat rule must be in force, or a bathroom break. 3rd set not yet started.
They've been mandatorily applying the heat rule for third sets, on all matches so far. This despite the temperature and humidity not reaching the usual thresholds required to invoke it. It's 'only' 29 degrees C and 61% humidity, which compared to Australia, or Cincinnati is clement.
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Data I post, opinions I offer, 'facts' I assert, are almost certainly all stupidly wrong.