expression, i-adjective
second to none; in a league of one's own
Idiomatic expression meaning that someone or something is the best, with no equal. Often used in the pattern 〜で右に出る者はいない (in ~, there is no one who surpasses). The phrase originates from the Chinese custom where the rightmost seat was the seat of honor.
彼は数学では右に出る者はいない。
He is second to none in mathematics.
この分野で彼女の右に出る者はいないだろう。
In this field, she is probably in a league of her own.