Tennis, just like soccer, has been automating officiating at tournaments: this year’s U.S. Open is no exception. The red lights you might have seen on the nets are an extension of the line-calling technology, which replaced line judges on courts by 2022. This is the system making all the “out” calls. TIME video producer Alyona Uvarova spoke with U.S. Open tournament referee Jake Garner about how the technology works.
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