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 the horses of interest for Sunday running at Chukyo Racecourse: 5th-CKO, ¥10,480,000, Maiden, 3yo, 1600mT DOUBLE JOKE (c, 3, Practical Joke--Double Date, by Rahy) is out of an unraced half-sister to Canadian Horse of the Year, champion 3-year-old colt and dual Grade I winner Peaks and Valleys (Mt. Livermore)...