Neo Universe, a son of Sunday Silence at stud at Shadai in Japan, and Birdstone, a son of Grindstone at stud at Gainesway, in Kentucky, have a lot in common.
For one, both are sons of Kentucky Derby winners. Sunday Silence won the Derby (and Preakness) in 1989; Grindstone won the Derby in 1996.
Second, both are classic winners, too. Neo Universe won the Japanese 2000 Guineas (Satsuki Sho at 2000 meters) and Derby equivalents (Tokyo Yushun at 2400 meters) in 2003; Birdstone won the Belmont Stakes in 2004.
Third, both are represented by two classic winners each from their first crops — 3-year-olds of 2009. Neo Universe is the sire of Japanese Derby winner Logi Universe