DEL MAR — Fillies Too Sassy (a 25-1 longshot) and Splendora (a 4-5 favorite) each won a $100,000 co-feature on Monday.

But there was a performance much earlier in the program in a second-level allowance race that could eventually have far greater impact on the sport.

Full Serrano, racing for the first time since going wire-to-wire to win the Breeders’ Cup Dirt Mile at Del Mar last November, covered the same course in 1 minute, 35.11 seconds to win by 7 ¼ lengths.

“That was very impressive, everything we hoped for,” trainer John Sadler said of Full Serrano’s return under Juan Hernandez as a 1-9 favorite.

A year ago this weekend, Full Serrano led the Pacific Classic for almost the entire distance before being overtaken by longshot Mixto in the final strides. Then came the victory in the

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