Prior to her importation to the United States, Dorine had already produced the Right of Way mare Dory, second dam of five Group winners in South America including 2004 Argentine champion sprinter Forty Doriana, 2000 Gran Premio Estrellas Carreras Sprint (ARG-G1) winner Dionisio Tom, and 1991 Las Oaks (CHI-G1) winner Doryanna. Following her arrival in Kentucky, Dorine produced a lone stakes winner, the Bold Ruler colt Our Hero, but made a much more significant contribution to North American breeding in her Hoist the Flag daughter Grecian Banner, the 1988 Kentucky Broodmare of the Year.
Grecian Banner is best known as the dam of the undefeated champion Personal Ensign, and rightly so. Aside from Personal Ensign's racing heroics, the daughter of Private Account produced three Grade 1 winners and a Grade 1-placed Classic sire (earning herself honors as the 1996 Kentucky Broodmare of the Year along the way) and is the ancestress of the bulk or Grecian Banner's good descendants in North America. Personal Ensign's full brother Personal Flag was not quite in the same league as his sister but won two Grade 1 races in his own right and proved a useful sire.
Master Johnny traces to Grecian Banner through Private Colors, an older full sister to Personal Ensign and Personal Flag. Much less distinguished than her siblings, Private Colors waited until the last of her nine foals to produce a stakes winner, the Johannesburg filly Private Dreams, who won a small stakes at Emerald Downs. Her previous production was not without merit, however. Her first foal, the unraced Mr. Prospector filly Team Colors, produced Japanese Group 2 winner God of Chance (by Cozzene) and English listed stakes winner Silver Colours (by Silver Hawk) and is the second dam of multiple English Group 2 winner Strong Suit. Another daughter, stakes-placed Golightly (by Take Me Out), is the second dam of 2017 Slovakian champion 2-year-old male King Heart.
Black Icon, Private Colors' 1995 daughter by the brilliant sprinter Mining, never raced and got only three minor winners from five foals, but her lone producing daughter, Kascha (by Awesome Again), has done very well at Haras Firmamento in Argentina, producing 2015 Gran Premio General San Martin (ARG-G1) winner Giacom (by Giacomo) and multiple Argentine listed stakes winner Jane Cash (by Johannesburg). Jane Cash, in turn, produced Master Johnny as her second foal.
Giacom was a late developer, taking down his biggest wins at age 6, and Master Johnny may be progressing along the same lines as he is now in the fall of his 3-year-old season according to the South American calendar. Whether or not he goes on to become a Group 1 winner, his most recent achievement raises the banner of an already well-known family and perhaps signals further glories to come.