The author never defines "nemesis". "Nemesis" was a goddess that punished hubris (extreme pride and arrogance). In British English, the traditional meaning of "

The author never defines "nemesis". "Nemesis" was a goddess that punished hubris (extreme pride and arrogance). In British English, the traditional meaning of "a nemesis" was someone with a greater power that inflexibly punished the lower-rank person. A recent meaning has emerged, where "a nemesis" is simply a long term rival. In American English, the Oxford dictionary defines a nemesis as "a person or a thing that is very difficult to defeat". Across the post, the word seems to variate significantly. In many cases (e.g. Nadal-Federer) it's pompous word for "rival" or "strong opponent". Overall, so many words for so little content.