​Welcome back to the Monday Tennis Briefing, where The Athletic will explain the stories behind the stories from the past week on court.This week, there was one of the strangest disqualifications in tennis history, the race to the ATP Tour Finals intensified and a player at the center of a storm broke new ground.If you’d like to follow our fantastic tennis coverage, click here.Why was a clay court the scene of the strangest default in recent times?When a player is disqualified from a tennis match, they usually spend some time in discussion with officials before they go. When Daniil Medvedev was defaulted from his China Open semifinal against Novak Djokovic this month for striking a fan in the face with a ball, he tried to plead his case; Djokovic did the same when he was defaulted from the 2020 U.S. Open for striking a line judge in the throat, also with a ball.But on Friday at the Guayaquil Challenger in Ecuador, Argentina’s Camilo Ugo Carabelli effectively disqualified himself by walking off court during his match against Brazil’s João Lucas Reis da Silva.After losing his serve to make it 5-5 in the first set, Carabelli dropped a couple of balls onto the clay, went to his bag and walked off the court while gesticulating toward the chair umpire. As the world No. 75 walked away, the umpire tried to ask Carabelli to change his mind, telling him “come here” in Spanish, but his efforts were in vain.Carabelli did not return to the court, meaning that the win was awarded to Reis da Silva.The Argentine refused to play on because of the conditions of the courts, which had been left sodden by persistent storms in Guayaquil. Flooding has been reported in the port city, and the tournament’s final was suspended on Sunday due to rain. On the point before he walked off, Carabelli lost his footing while trying to change direction.NO RECUERDO ALGO SIMILAR 🚨🚨🚨Camilo Ugo Carabelli SE RETIRÓ de su partido ante Reis Da Silva por el pésimo estado de las canchas en Guayaquil. Literalmente se fue.¿Lo curioso? El brasileño festejó el triunfo.Imágenes increíbles. pic.twitter.com/16zArviZYY— Gonzalo Ferreyra (@gonzaloferreyr) October 31, 2026In a statement issued the following day, Carabelli apologized for his actions, saying that he had not intended to effectively self-default.“I wanted to continue playing and competing, but I truly felt that doing so in those conditions was a risk,” he wrote in Spanish.“In the moment, I did not fully grasp what was happening nor what the consequences could be (for walking off court). Nor did I listen to what the umpire was warning me about.”Carabelli also expressed regret for how he behaved toward the tournament’s staff, saying he appreciated their efforts to make the courts playable in such challenging conditions.— James HansenHow did a player overcome a persistent problem to break new ground?On Sunday in Guangzhou, China, Harriet Dart thought it was happening again.After hitting a double fau