(KEY OFF)(KEYWORD)lexander M. Keiles, 70, a prominent tennis player and coach for many years in this area, died Friday at Suburban Hospital after suffering a heart attack.

Mr. Keiles held more than 200 trophies for tennis competition, was ranked fifth nationally in senior singles competition in 1953, and won the Baltimore Evening Sun tennis tournament three times during the late 1940s.

A native o Baltimore, he moved here in 1952, and served as an instructor at a number of area clubs, including the Edgemoor Club in Bethesda, where he coached his best pupil, Donald Dell.

Mr. Dell first met Mr. Keiles at the Edgemoor in the early 1950s, was coached by him for several years, and went on to become a five-time member of the American Davis Cup Team and captain of the team in 1968 and 1969.

Mr. Keiles was an administrator and instructor at the Indian Tennis Club in suburban Maryland during the late 1950s and had given private tennis lessons until fairly recently.

He helped found the Mountain Lake Tennis tournament in Oakland, Md., in 1927.

Mr. Keiles attended Johns Hopkins University. He served in the Army during World War II.

After moving here, he worked for many years as a cosmetics representative with Elizabeth Arden, and later worked from 1968 to 1976 as a sporting goods salesman with the Bancroft Sporting Goods Co.

He is survived by his wife, Elsa O., of the home in Bethesda.