Pay the Man, who needs just $1,049 to become the all-time leader in money won by an Ohio-bred female runner, will face six rivals Saturday at Thistledown in the $50,000 Rose DeBartolo Memorial, a nine-furlong race she has won the last three years. The only other horse to win the race three times was Tougaloo, the top statebred female in money earned. Unless something unfortunate happens, Pay the Man should be the top money earner following the race, as the first six finishers will get checks.   Pay the Man, a 6-year-old bay homebred daughter of Bernstein out of Pyrite Captain, by Magesterial, is owned by the Pyrite Stable and trained by Miguel Feliciano. She has won 11 of her 14 starts at Thistledown. She has a lifetime record of 15-4-7 from 41 starts and has earned $581,981, Tougaloo won 13 of 31 starts and banked $583,030.   Pay the Man has a 1-2-1 record from 6 starts this year, including a victory in the J.W. Petro Memorial Stakes going 1 1/16 miles at Thistledown on June 16. In her last race on Aug. 7, she stopped badly in a six-furlong stakes at Mountaineer Park.   Pay the Man should have little trouble naking the lead in the DeBartolo. Ricardo Feliciano, nephew of the trainer, will be in the irons. The main opposition for Pay the Man should come from Slides Choice and Squeezer's Palace.   Slides Choice, a 4-year-old Devil His Due filly, had a rough trip in her last race, the Vivacious Stakes on the grass at River Downs on Aug. 7, and before that was beaten a neck by Pay the Man in the Petro. She was second to Pay the Man in last year's DeBartolo and beat Pay the Man by a nose in the Ohio Distaff last October going nine furlongs.   Slides Choice, trained by Tim Hamm, will be ridden by Jason Lumpkins.   Squeezer's Palace won the Queen City Oaks going nine furlongs in her last start on July 17 at River Downs. She is also trained by Hamm, and Pablo Morales will do the riding.