Close Hatches ran away from her competition in the Personal Ensign last out (NYRA/Adam Coglianese Photography)

Keeneland's Grade 1, $500,000 Spinster on Sunday will be the final prep for Close Hatches ahead of the October 31 Breeders' Cup Distaff at Santa Anita, and the dark bay filly looks nearly unbeatable based on current form.

The First Defense four-year-old captured the Apple Blossom Handicap and Azeri at Oaklawn Park over the spring, and romped by five lengths last out in the Personal Ensign at Saratoga.

"She's got a lot of confidence because she's been winning and she's coming off a good race," trainer Bill Mott said. "We just hope that she handles the surface as well as she handled the last one. The last one was in the mud, and she ran very well."

Close Hatches is four-for-four thus far this season and would boast a seven-race win streak if not for a runner-up effort to Beholder in last year's Distaff. The duo met up again in the June 7 Ogden Phipps at Belmont Park, with Close Hatches taking the head win while Beholder finished a length behind in fourth after suffering an injury in the race. Beholder just returned on September 27 to take the Zenyatta in her final start before the Breeders' Cup.

Mott chose the Spinster for Close Hatches' last prep, taking full advantage of Keeneland's transition back to a conventional dirt track. The Juddmonte Farms colorbearer made her first appearance on the new main track Thursday morning to prepare for Sunday's 1 1/8-mile race.

Don't Tell Sophia will try to turn the tables on Close Hatches in the Spinster (Churchill Downs/Reed Palmer Photography)

Among Sunday's contestants is Don't Tell Sophia, who is 4-1-1 from her last five, including a third-place effort to Close Hatches in the Azeri. The Philip Sims-trained six-year-old has competed just once more since that March 15 contest, returning to take the September 6 Locust Grove at Churchill Downs. Joe Rocco Jr. was aboard for that 2 1/4-length score, as well as for her victory in last November's Chilukki under the Twin Spires, and retains the mount Sunday.

Molly Morgan owns some Churchill wins of her own, including a romping four-length triumph in the Fleur de Lis Handicap on Kentucky Oaks Day. She posted a head decision in the Gardenia two back and was second to Don't Tell Sophia in the Locust Grove. Corey Lanerie has the call in the Spinster.

Grade 1 winner Ria Antonia, Group 2 heroine Shuruq and multiple Grade 2-placed Got Lucky complete the Spinster field.

One race earlier, a field of nine juveniles has been entered in the Grade 3, $250,000 Bourbon going 1 1/16 miles on Keeneland's turf. Like the Spinster, it is a "Win & You're In" race, specifically for the Breeders' Cup Juvenile Turf on October 31 at Santa Anita.