The duo scored aboard first-time starter Field Pass ($9.40) in the opener, second-time starter Chelsea Road ($6) in the fifth and completed the hat trick in the 10th race when Pimentel sent Thunderous Lady ($3.80) around traffic.
Pimentel rode four winners Saturday, also taking the fourth race with Cho Time ($19).
"I looked at the program this morning and thought I had a chance at a big day," Pimentel said. "When you ride for someone like Mike, you expect to win races."
Trombetta expects to have seven runners on next Saturday's Jim McKay Maryland Million program. The Baltimore-born conditioner nominated DCDancer (Nursery), Glich (Nursery), Change of Command (Turf), Friscan (Sprint), Brushed by Love (Distaff), Music Please (Distaff) and Baltimore Belle (Ladies).
"For the local breeders and owners, this is our Super Bowl," said Trombetta, who has four Maryland Million victories. "We try to aim our Maryland-sired horses in this direction."
Pimentel has ridden all of Trombetta's Maryland Million winners. In addition to riding most of Trombetta's horses next Saturday, the 31-year-old also has the assignment on millionaire Ben's Cat (Turf Sprint), who is looking to become the fourth horse to win a Maryland Million race three straight years.
Horse rescue open house
The Thoroughbred Retirement Foundation — the largest organization in the world dedicated to the rescue, retirement, and adoption of thoroughbred racehorses — will hold an open house at its Central Maryland Correctional Facility-based Second Chances Farm in Sykesville on Friday from 10 a.m. to 1 p.m.
The farm is home to six former racehorses, and there are plans to expand.
Admission is free, but an RSVP is requested. Information: trfinc.org.