Graded stakes winner Mr. Sinatra and 6-year-old Gerosa will enter stud at Joe and Karen Jennings' Walnford Stud near Allentown, N.J. Each is owned by a partnership.Mr. Sinatra, a 9-year-old son of Mining, made all but nine of his 62 starts for Barbara Davis and trainer Gasper Moschera, who recently retired from training. Davis had claimed Mr. Sinatra for $75,000 in August of 1997. All 13 of Mr. Sinatra's stakes wins and stakes-placings came for Davis.Mr. Sinatra captured the Stuyvesant (gr. III), Discovery (gr. III), Westchester (gr. III), Queens County (gr. III), and Aqueduct (gr. III) Handicaps, and placed in eight stakes, six of which were graded. He retired with 13 wins and earnings of $728,355. His dam, Midnight Stroll (by Private Account), is a half-sister to stakes-winning, stakes producers Coesse Express and Etoile de Huit. Mr. Sinatra's fee is $3,000.Gerosa, a son of Cherokee Run out of the Conquistador Cielo mare Sky Meadows, went undefeated at Monmouth Park in his first four starts, winning at six to 8 1/2 furlongs. Campaigned by Phantom House Farm, he retired with four wins from seven starts and earnings of $88,300. He is a half-brother to millionaire Dixie Dot Com and to the dam of grade I winner Siphonic. His fee is $2,000.