Sunday Silence (1986-2002) is a successful American racehorse and winner of two of the American Triple Crown in 1989. The horse, however, is better known as the leading sire in Japan for 13 years, including 5 years [i]posthumously[/i]. Many of his numerous offspring and descendants became successful racehorses themselves and several became popular sires and broodmares in their own right, especially [[Deep Impact (racehorse)|]] (2002 - 2019), one of his most successful offspring and successor as a long-streaking leading sire (11 years and counting). His influence is so pervasive to the point that nowadays, almost all racehorses in Japan racing at the highest level and aren't foreign-bred are direct descendants of Sunday Silence.

In the context of [i][[Umamusume]][/i], he is the RL sire or ancestor of a significant portion of the horse girls, especially the youngest in RL. Whenever he is portrayed as a horse girl, he usually takes the form of a [[look-alike]] of [[Manhattan Cafe (umamusume)|]] (or being just portrayed [i]by[/i] Manhattan Cafe) due to the original horse being said to be the spitting image of his sire, to the point of being able to stand-in as Sunday Silence in a TV movie about him and his Japanese owner, Yoshida Zen'ya.
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