As New York City contends with rising heat and unpredictable storms because of climate change, so does its marquee tennis tournament, the U.S. Open. Weather has long been a wild card for outdoor sporting events. But global warming is forcing tennis officials to make lasting changes to the tournament to protect spectators and athletes. “I’m checking in with the weather more than I care to admit,” said Jake Garner, the tournament referee, who oversees all officiating matters, including the daily schedule of play. In 2021, remnants from Hurricane Ida delayed matches and caused flooding, but extreme heat has been the more common threat.

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