Upsets were prominent on Tuesday's Blue Grass Day undercard at Keeneland, the biggest being Positano Sunset's 14-1 surprise over the favorite Emery in the $623,338 Madison (G1) for fillies and mares.

A days-long wet weather system forecast to affect central Kentucky this weekend could wreak havoc on Keeneland's signature program of the spring meet on Saturday, in particular the two stakes scheduled for the turf.

While the Tampa Bay Derby (G3) was Saturday’s main event, Festival Day 45 also included four supporting stakes.

Aidan O’Brien shipper Lake Victoria was by far the class of the field in Friday’s Breeders’ Cup Juvenile Fillies Turf (G1), and that enabled the 3-5 favorite to overcome a problematic trip at Del Mar.

British invader New Century stamped his ticket to the Breeders’ Cup Juvenile Turf (G1) in Saturday’s $368,918 Summer (G1) at Woodbine.