I recommend "Word Freak" by Stefan Fatsis if you're looking for a non-fiction novel about the world of competitive Scrabble. It's one of the most entertaining and well-written books I've ever read. Almost impossible to put down once you've started it.
Stefan Fatsis also being the author of this article, so if you've read the article you've already gotten a preview of his writing style. (Just mentioning in case someone hadn't put that together.)
https://www.amazon.com/dp/0142002267