Lil Jackson Cat and Lloyd Cox marked 223 Sunday for the high score in the first round of the Open Classic Challenge at the NCHA Summer Spectacular, presented by Great American Insurance.

Ninety-two horses marked 214 or better to advance to Monday’s second round.

Lil Jackson Cat is a 6-year-old mare bred by Ken Jackson and owned by Thomas and Natalie Humprheville of Glenwood, New Mexico.

She is by all-time leading sire High Brow Cat out of Money Talks Smart, making her a full sister to $245,000 earner High Brow Jackson.

With Cox riding, Lil Jackson Cat won last year’s Cotton Stakes, and was a finalist in the NCHA Super Stakes Classic this spring. The mare also won last year’s John Deere Division of the Classic Challenge with Nate Miller on board. She has earned more than $104,000.

Three horses marked 222 for the second high score. They were CR Tuff Lucy and Johnny Royal from Saturday, and Sweet Lil Amanda, ridden by Matt Miller for Chris and Tracy Brengard on Sunday.