Novak Djokovic's 'Iron Man' equipment may return to the US Open in the coming days.
Eye-test and analytic fans agree in 2023. Riley has improved defensively after a terrible April.
The 23-time Grand Slam winner called the unobtrusive chest patch's benefits 'the biggest secret of his career', and its developers have subsequently revealed them.
Djokovic wore the coin-shaped device during the French Open and Wimbledon this year.
The 36-year-old remarked, "When I was a kid I liked Iron Man a lot, so I try to impersonate him," when first asked.
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