Central Kentucky stallion Fly So Free moved to the top of the leading sires list once the $3.6 million earned by his son Captain Steve in the March 24 Dubai World Cup (UAE-I) was added to his total, and now it appears that he will stay at the top for quite some time. His progeny earnings total of $4,212,504 is more than double the amount belonging to runner-up Phone Trick, with $1,792,867.A son of Time for a Change out of the Stevward mare Free to Fly, Fly So Free stands at Robert N. Clay's Three Chimneys Farm near Midway. Phone Trick (Clever Trick -- Over the Phone, by Finnegan) stands at John T.L. Jones Jr.'s Walmac International near Lexington.Thunder Gulch, who ranked 11th on last week's sire list, advanced to fifth once the $450,000 earned by his son Point Given in winning the April 7 Santa Anita Derby (gr. I) was added to his total. On the same day as the Santa Anita Derby, Thunder Gulch's daughter, Tempest Morn, won a group I stakes in Australia. Thunder Gulch (Gulch -- Line of Thunder, by Storm Bird), who has progeny earnings of $1,551,834, stands at Ashford Stud near Versailles, Ky.Top 10 stallion Dynaformer was represented by a pair of Keeneland stakes winners the first part of April and moved up two places to eighth on the sires list. Both races were at a mile on grass for 3-year-olds. His son Baptize won the April 6 Transylvania Stakes, and his daughter Bold Answer captured the Appalachian Stakes two days later. Dynaformer (Roberto -- Andover Way, by His Majesty) has progeny earnings of $1,291,530 and stands at Three Chimneys.Another top 10 stallion, Cee's Tizzy, a former leader on the general sire list, was represented by a grade I winner the first weekend in April. His daughter Gourmet Girl won the April 8 Apple Blossom Handicap (gr. I). Cee's Tizzy ranks fourth on the list, with progeny earnings of $1,668,535. Cee's Tizzy (Relaunch -- Tizly, by Lyphard) stands at John C. Harris' Harris Farms near Coalinga, Calif.Two-year-old racing started about a month ago, and first-year stallion Devon Lane has advanced to the top of the list. His son Devon's Prospect won the April 8 Copper Top Futurity at Sunland Park for his third win in as many starts. Devon Lane (Storm Cat -- To the Hunt, by Relaunch) has progeny earnings of $82,142. He stands at Vessels Stallion Farm near Bonsall, Calif.