Wow, I played during the heat spell on Monday, around 88 degrees, approaching 90. Seriously, I almost suffered from heat exhaustion, hitting with my 4.0 bud who hits hard and flat. Had to drink a whole one liter Gatorate, at one time, and sit for 10 minutes in the shade. Could hardly breathe. We had only hit for 20 minutes.
Oh, second attempt at a serve, DunlopHDHardcourt balls, bounced chest high on the backboard, on a slight mishit swung at maybe 90% speeds.