Fourth-round matches at the U.S. Open were briefly halted due to a fire alarm in the broadcast building, which houses the Hawkeye electronic line-calling system, leading to a six-minute delay. The tournament, which does not use on-court line judges, relies entirely on the Hawkeye system for calls. Daniil Medvedev was leading his match against Nuno Borges when play was stopped, and both players expressed confusion over the situation. Similarly, Caroline Wozniacki's match against Beatriz Haddad Maia was also interrupted. After confirming it was a false alarm, play resumed, with Medvedev winning 6-0, 6-1, 6-3, while Haddad Maia triumphed 6-2, 3-6, 6-3. The USTA stated that measures were taken to ensure the incident was handled swiftly and did not disrupt the tournament significantly.