Serena’s coach admits he made a signal prior to US Open final meltdown | Serena vs. The Umpire

In an excerpt from ESPN's Backstory: “Serena vs. The Umpire," investigative reporter Don Van Natta talks with Serena Williams’ tennis coach Patrick Mouratoglou about the coaching signal he made during the 2018 US Open final vs. Naomi Osaka.

Catch the re-air of ESPN's Backstory: “Serena vs. The Umpire”
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