Royal Roberto, 14th in the Kentucky Derby but winner of the Everglades, Lexington and DeWitt Clinton stakes this summer, has been high-weighted at 118 pounds for Saturday's running of the $100,000-added Governor's Cup Stakes at Bowie.

The Governor's Cup, richest race of the 36-day meeting, will be contested at 1 1/8 miles by 3-year-olds.

Royal Roberto will be ridden by Jim Edwards. His biggest challenges are expected from Dew Line and Hidden Capital, each carrying 114 pounds.

Dew Line has won more than $120,000 this year. His best effort was in losing by a nose to Wolfie's Rascal in the American Derby in Chicago. Wolfie's Rascal, who had been high-weighted for the Governor's Cup, was withdrawn after his owners were advised that he could not run with the diuretic Lasix. Wolfie's Rascal is a bleeder; Lasix is used for such animals.

Hidden Capital, winner of the Rosemont Stakes at Delaware Park in August, will be ridden by John Adams.

Completing the field of 16 are Semaj, Fast As The Breeze, Mid Yell, Shy Groom, No Home Run, Swing The Blade, Trenchant, Uno Roberto, Count Disco, Lord Lister, Hush Hush Flash, Northrop and Lejoli.

Lejoli, at 112, has earned more than $155,000 while winning only one race. But the colt has been chasing such 3-year-olds as Aloma's Ruler and Conquistador Cielo.

Gov. Harry Hughes will present the trophy to the winning owner. The Governor's Cup was first run in 1955, Gov. Theodore McKeldin presenting the cup to the owner of Boston Doge.