Alabama Alaska Arizona Arkansas California Colorado Connecticut Delaware Florida Georgia Hawaii Idaho Illinois Indiana Iowa Kansas Kentucky Louisiana Maine Maryland Massachusetts Michigan Minnesota Mississippi Missouri Montana Nebraska Nevada New Hampshire New Jersey New Mexico New York North Carolina North Dakota Ohio Oklahoma Oregon Pennsylvania Rhode Island South Carolina South Dakota Tennessee Texas Utah Vermont Virginia Washington West Virginia Wisconsin Wyoming

AmWager — Get $50 New customers 21+ only

Select your state

Alabama Alaska Arizona Arkansas California Colorado Connecticut Delaware Florida Georgia Hawaii Idaho Illinois Indiana Iowa Kansas Kentucky Louisiana Maine Maryland Massachusetts Michigan Minnesota Mississippi Missouri Montana Nebraska Nevada New Hampshire New Jersey New Mexico New York North Carolina North Dakota Ohio Oklahoma Oregon Pennsylvania Rhode Island South Carolina South Dakota Tennessee Texas Utah Vermont Virginia Washington West Virginia Wisconsin Wyoming

AmWager — Get $50 New customers 21+ only

21+ and present in eligible US states. New customers only. Offer terms apply. Gambling problem? Call 1-800-GAMBLER.

Select your region

US UK

Please play responsibly · 21+

NORTH AMERICAN RACEHORSE

Efficacy — Profile, Stats, Next Race & Odds

Full Efficacy racing profile · with pedigree (Aldrin × Stevie the Cat) · 1 upcoming race at US tracks. Live morning-line odds, jockey/trainer connections, surface and distance preference — updated daily from official US racing data.

1 upcoming start By Aldrin

★ Pedigree & connections

SIRE (FATHER)

Aldrin

DAM (MOTHER)

Stevie the Cat

by Stevie Wonderboy

TRAINER

Joanne Shankle

LAST JOCKEY

Ruiz J

JOCKEY CLUB REG.

20002928

⏱ Upcoming — Friday 7 August 2026

R9

Colonial Downs · R9

1 Mile · Turf · CLAIMING · $34,500 purse · post #2 · 123 lb · jockey Ruiz J · Lasix