April 24 (UPI) -- The last of the Kentucky Derby contenders are on their way to Churchill Downs, while the makeup of the 20-horse field continued to evolve with Stark Contrast out and Intrepido moving in.

As attention focuses on Louisville, the rest of North American racing takes a bit of a breather. Hong Kong picks up the action with an historically tough edition of Champions Day -- three Group 1 races Sunday.

The Road to the Roses

By Saturday, the field will be assembled for the 152nd running of the Kentucky Derby on May 2. That's the deadline for contenders to be on the Churchill Downs backstretch, but a few were pushing the deadline to put in final major works on their home training surfaces.

Among them was Arkansas Derby winner Renegade, who breezed a half-mile in 50.94 seconds Thursday morning at private training facility Palm Beach Downs in Delray Beach, Fla., before shipping north.