Not meant as a defense for Borges in any way, but just how many ways are there to report some of this stuff? When writing about stats, it is all going to sound the same unless you really mess with the phrasing. You figure most stuff by reporters is formulaic, especially after they get used to it all being edited into a template. Editors will dumb it down to the level of their caricature of a sports section reader so you know it will all sound the same. Pretty soon you adjust your writing to match that template. It becomes one big feedback loop.
That certainly explains a one time or occasional match but here there is a long string. Still, similarities are bound to exist. We'll see.
Facts are facts but style is unique. But plagiarism buy any other name is theft.