Trainer King T. Leatherbury saddled his third consecutive stakes winner yesterday when Ten Ten the heavy favorite, won th $60,533 Maryland Futurity at Laurel by eight widening lengths over Doc's Rock, M.A.'s Date finished third, three quarters of a length farther back.

Leatherbury began his stakes streak when Ten Ten won the Senatorial 10 days ago. Last Saturday the Shadyside, Md., conditioner sent out Do The Bump to score an upset in the Japan Racing Association Handicap. Leatherbury is the nation's current leader in total winners for the year. He is the present leader at Laurel with 30.

Ten Ten broke well for veteran Bill Passmore, following the early lead of Call The King. As the field approached the stretch turn Passmore sent Ten Ten to the front as Call The King bore out while tiring.

Straightened away from home the 2-year-old son of Rambunctions drew away under a vigorous hand ride while the real battle was for second place between Doc's Rock and M.A.'s Date.

"His (Ten Ten's) last race, the Senatorial, wasn't a fluke after all," Leatherbury said."He's improved every start for the past four races. I'm undecided where to start him next because there are no more Maryland-bred 2-year-old stakes. I'm going to go on with him because there's no reason to stop with a horse when he's going so good."

"Leroy (Call The King's rider) lost a rein and his horse was getting out, said Passmore," so I had to go right by him when we were head and head rounding the turn."

Ten Ten ran the mile over a "good" track in 1.37 4/5. Coupled with Doc's Rock in the exacta returned $48.20 on the numbers 5 and 7.