'He's a horse that's matured since the Cox Plate where he ran a valiant second to one of the best horses in the world.' Castelvecchio finished second in the 2019 Cox Plate. Image: News Corp AustraliaThe Moonee Valley Racing Club committee were forced to make a decision on the final spot in Saturday’s Cox Plate after there were 15 acceptors for the weight-for-age classic. The committee were keen to see a three-year-old in the race, giving Grandslam, who was a late nomination for the Cox Plate, the final spot in the field, punters.com.au reports. COX PLATE 2020 - FINAL FIELD AND BARRIERS1.