Everything that happened Day 2 of the French OpenWelcome to the French Open briefing, where The Athletic will explain the stories behind the stories on each day of the tournament.On Day 2, it was a scorcher in every sense, as the sun beat down. Players and fans responded in kind.How did players and fans respond to scorching heat?For the second day of the French Open main draw, temperatures reached 91.4 degrees and stayed there into the evening.For fans, queues to fill up water bottles and stand underneath shower sprinklers lengthened throughout the day. But such conditions did not deter them from packing the courts, nor waiting over half an hour to gain a prime spot on tiny courts. In the early rounds of a major, big stars always play at venues that resemble a modest club.For the first time at Roland Garros, digital boards above walkways around the complex provide real-time updates on how full a court is.Despite Court 7 saying it was 98 percent full, tennis fan Nawfel Barah remained patient in a queue which wrapped around the court’s walls. “In the heat, that’s not ideal for a tennis life,” he said.However, Romuald Pattier from Normandie, sporting a tied shirt around his neck to protect himself from sunburn, said he would take this type of weather over rain any day of the week. “It’s harder for the players than the fans,” he said.That was true Monday. During No. 11 seed Andrey Rublev’s win over Ignacio Buse, a ballkid required assistance after feeling dazed at the end of a point. No. 15 seed Casper Ruud was two sets up and served for the match against Russia’s Roman Safiullin, but almost literally wilted in the heat. Ruud lost the next two sets, but Safiullin experienced physical issues of his own, and Ruud recovered quickest to win in five sets.Players don’t just have to adapt physically.Heat lowers air density, so shots travel faster. It also makes air expand, increasing the pressure inside a tennis ball and making it bounce higher.