This begs the question of where did he learn defeat, like you said. There are a number of other possibilities that can come up - illness in childhood, bad grades, loss of friends or something (or maybe he encountered a loss in tennis at a young age, in a private game, that made him strive to be the best).
This and the quote above make me wonder about Yukimura. He implies that Sanada is at the peak there. Does he think about the future at all? Think about the tennis after this moment? Or does he expect Sanada - and himself, in extension - to always be at the top?
It makes it interesting to consider this in terms of his surgery and subsequent defeat at the hands of Echizen.
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This and the quote above make me wonder about Yukimura. He implies that Sanada is at the peak there. Does he think about the future at all? Think about the tennis after this moment? Or does he expect Sanada - and himself, in extension - to always be at the top?
It makes it interesting to consider this in terms of his surgery and subsequent defeat at the hands of Echizen.