Tyler B., the seventh-leading money earner among 2-year-old pacers a year ago, heads the 15-horse, two-division William E. Miller Memorial Pace at Rosecroft Raceway tonight.

Maryland's richest harness event at $112,500, the Miller will consist of two $56,250 events -- Rosecroft's fourth and ninth races -- because of the large field.

Tyler B., purchased as a yearling for $220,000, is a bay son of champion Most Happy Fella. He earned $136,513 in 1979, winning 10 of 21 races and finishing in the money 17 times for trainer Del Miller.

Driven by Bill Herman, Tyler B. will be the probable favorite in the eight-pacer second division after qualifying at the Meadowlands May 3 in 1:58.

Tyler B's competition will include Lex Hanover; J.D.'s Buck; Honorable Winner, a 1:57 4/5 winner May 1; Nanseroan; Fat Cat; Really Swinging and Dear Star, who was clocked in 1:56 4/5 as a 2-year-old, winning nine of 19 trips and $68,590.

The seven-pacer first division features Sans Strike, a top prospect in 1979 when he won four of 13 starts and $88,749 for Canadian driver Shelly Goudreau; Barman Lobell; Trusty Tough Guy; Finian Hanover; Sly Beau; Worthy Signal and Alba Time.