While it's not clear who exactly coined it, this term (a letter away from a piece of equipment in another Olympic sport) is believed to have been the invention of Severin Lüthi. Lüthi, a man with a Harry-Potter-esque name, has been team captain of the Swiss Davis Cup team for a few years.
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The term is "SABR", or "Sneak Attack By Roger" and refers to the new tactic used by Roger Federer in late 2015, to return second serves on the half-volley.
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