Gulfstream Park - Jockey Tyler Gaffalione, who has gotten off to a solid start at Gulfstream's Championship Meet with two wins on Friday's opening day program and two more Wednesday, will seek his first stakes win of the winter session aboard Mark Breen's Endorsed in Saturday's $100,000 Mr. Prospector (G3), a seven-furlong sprint for 3-year-olds and up that will be the first of 37 graded-stakes on the Gulfstream's $14.26 million stakes schedule.

Endorsed, who was claimed for $100,000 out of a third-place finish in an Aug. 26 optional claiming allowance at Saratoga, has been winless in three starts for trainer Mike Maker, finishing third in the Louisville Thoroughbred Society Stakes, fourth in the Phoenix (G2) at Keeneland and a close third in an optional claiming allowance at Churchill while being ridden by Gaffalione for the first time.

"Since Mike took over his training, he's really coming into his own. He's had three big performances in his last three races against top-quality horses," Gaffalione said. "It seems like he leaves himself with too much to do. I'm hoping the extra difference will help him out and he gets a clean trip."

The 5-year-old son of Medaglia d'Oro is graded stakes-placed and has run respectably in a few Grade 1 stakes, but he is still seeking to win his first stakes in a steady 23-race career.

Albaugh Family Stables LLC's Dennis' Moment enters the Mr. Prospector coming off his first win since capturing the 2019 Iroquois at Churchill Downs. The Dale Romans-trained son of Tiznow captured a seven-furlong optional claiming allowance at Keeneland.

Corey Lanerie has the call aboard Dennis' Moment.

Drain the Clock was nominated to the Mr. Prospector, but trainer Saffie Joseph has opted to run the Grade 1 winner in a Friday optional claiming allowance off a layoff and run Daniel Alonso's Wind of Change and Vegso Racing Stable's Officiating in Saturday's stakes.

Wind of Change, who won the ungraded Mr. Prospector at Monmouth in May, is coming off a second-place finish in an optional claiming allowance in his first start on Gulfstream's Tapeta course.

"I thought he handled it well. Obviously, going in there was a bit of unknown because he had never been on it. Overall, I thought it was a good race," Joseph said. "The horse that beat him [King of Dreams] came back and won a stake. A good horse beat him."

Joseph expects Wind of Change to be a forward factor in the Mr. Prospector.

"His best style of running is on lead, so we're trying, hopefully, to go to the lead," he said.

Edgard Zayas has the mount aboard the Brazilian-bred 6-year-old.

Officiating, who made a strong middle move on Tapeta before fading in the Showing Up, won the off-the-turf Bear's Den at seven furlongs over a sloppy track in his previous start.

"He's kind of a weird kind of horse. We've only had him for four starts, and he's trained really well on the dirt. We only ran him once on dirt, and it was on the slop, and he handled it well. He won a stake," Joseph said. "His previous races on dry dirt, he's never hit the board. It's kind of an experiment. He's training so well on the dirt. I want to give him one try."

Luis Saez is scheduled to ride Officiating for the first time.

Calumet Farm's Flap Jack, Russell Staggs' Doc Amster and Stonehedge LLC's Poppy's Pride round out the field.

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