In this continuing series, we take a look ahead at US-bred and/or conceived runners entered for the upcoming weekend at the tracks on the Japan Racing Association circuit, with a focus on pedigree and/or performance in the sales ring. Here are Sunday's horses of interest for this weekend running at Niigata and Tokyo, the site of the G1 NHK Mile Cup, featuring GI Breeders' Cup Filly and Mare Sprint winner Wavell Avenue (Harlington)'s son Grenadier Guards (Jpn): Sunday, May 9, 2021 1st-NII, ¥9,680,000 ($89k), Maiden, 3yo, f, 1800m ELEPHANTINE (JPN)...