Grantland and Deadspin correspondent presents a breakthrough examination of the professional wrestling, its history, its fans, and its wider cultural impact that does for the sport what Chuck Klosterman did for heavy metal.   The Squared Circle grows out of David Shoemaker’s writing for Deadspin, where he started the column “Dead Wrestler of the Week” (which boasts over 1 million page views) — a feature on the many...