Daniil Medvedev has reached his fourth U.S. Open semifinal as the heat and humidity continue to rise at the Grand Slam tennis tournament. He looked into a courtside TV camera in the final set of a 6-4, 6-3, 6-4 victory over Andrey Rublev on Wednesday and warned that a player is ‘gonna die’ in the nearly 95-degree Fahrenheit (35-Celsius) conditions. Medvedev, the 2021 U.S. Open champion, will face defending men’s champion Carlos Alcaraz next. Alcaraz beat Alexander Zverev 6-3, 6-2, 6-4. Aryna Sabalenka and Madison Keys will meet in the women’s semifinals on Thursday. Both won in straight sets Wednesday.