Sweltering heat was the theme of semifinal Sunday at the Ultimate Tennis Showdown 2, and some of the shots were just as hot as the temperatures. Here are the best five moments from Saturday's action. 

1

Everyone knows that Tourna-Grip is a great over-grip when playing in extreme heat. Maybe Nicolas Mahut will look to make the switch after losing his racquet on this serve. 

2

If you don't know much about Corentin Moutet just watch this point. He's already one of the best movers on the ATP Tour. 

3

Alexander Zverev continued his dominance over Felix Auger-Aliassime. Zverev beat him twice in 2019, both times in straight sets, and added a UTS victory over the Canadian in sudden death. A running-forehand passing shot was the highlight of the match. 

4

A literal child made her Ultimate Tennis Showdown debut, and wasn't half bad. Brenda Fruhvirtova, a 13-year-old prodigy, is the reigning Le Petit As champion and trains at the Mourotoglou Academy. She lost but showcased her brilliant two-handed backhand in the process. 

5

They say it's better to be lucky than good, and it's tough to get any luckier than this. Ons Jabeur played her winner X3 points card, and surprised Anastasia Pavlyuchenkova with a let cord ace worth three points.