Tony DeLuca of Chantilly captured the medal in the South Atlantic Junior Amateur golf championship at Crofton yesterday with a one-under-par 71. A stroke back were Mark Kingham of Simsbury, Conn., Dick Getek of Richmond. Bob Wrenn of Richmond and Charles Gates of Columbia.

A total of 210 players representing 11 states competed in the two divisions - 16-17 and 14-15. A thunderstorm interrupted play for almost two hours but the older group comprising 141 golfers managed to finish. The cutoff for the 64 places at match play in the 16-17 championship flight was 82, with 10 golfers playing off for six spots.

The elder boys will play two 18-hole matches today, two Wednesday and two Thursday. The younger players interrupted by rain will have a flight of 32 and will play one 18-hole match today. One is scheduled Wednesday and two Thursday.

DeLuca, 17-year-old senior at Oakton High School, birdied the second hole from eight feet and double-bogeyed the par four third hole, going over the green and chipping poorly. He birdied the fourth from 30 feet and the sixth from six feet. Then he registered 12 straight pars.

Kingham was out in 38 with a double boyey, two bogeys and two birdies and was home in 34 with two birdies.

Wrenn started on the back nine and had 33, including four straight birdies.But he faultered on the front side with 39. Gates also started on the back and had a one-under-par 35. He shot 37 on the front.