Michael G. Vlahos, 61, former owner and operator of Sports World Inc., a sporting goods store here, and a leader in amateur baseball and youth development programs in this area for many years, died of cancer Sunday at his home in Brentwood, Md.

Mr. Vlahos, a native of Baltimore, drove a taxi and operated a gas station here as a young man. He later owned and operated a restaurant-pool parlor and sold sports equipment to local schools. He established his sporting goods store here in the early 1960s and retired in 1968.

He was a vice president of the All American Amateur Baseball Association and, since 1971, had served as president of the Clark C. Griffith Memorial Baseball League, a charitable, nonprofit organization for teen-agers in Fairfax. He was president of the D.C. Home Plate Club here three times and in recent years was club treasurer.

Mr. Vlahos coached sandlot baseball here years ago and coached and sponsored numerous local youth sports teams through the years. He was credited with helping obtain about 200 college scholarships for members of the Griffith league, which so far has produced 100 professional baseball players, 10 of whom played in the major leagues and 30 of whom played in the minors.

In 1970, while serving his second term as president of the D.C. Home Plate Club, he helped arrange for the club to pick up the franchise of the Griffith league, which was founded in 1935 as the National Capital City Junior League and which was about to fold for want of a permanent field and lack of attendance. With the help of George Mason University's athletic director, Raymond H. (Hap) Spuhler, he arranged for the league to have exclusive use of the university's baseball stadium.

In 1971, the six-team league was playing a 14-game schedule, later expanded to 60 games.

Mr. Vlahos was a member of the Touchdown Club and a former chairman of its trophy committee. Last year, he was inducted into the D.C. Home Plate Club's Sandlot Hall of Fame, which he helped found in 1970.

Survivors include his wife of 44 years, the former Merry E. Ireland, of Brentwood; two sons, Michael G., of Silver Spring, and Joel, of Dale City, Va.; four sisters, Sophia Callas and Olga Privolas, both of Mount Rainier, Tessie Fontanilla of Oxon Hill, and Anna Bishop of Beltsville; two brothers, Nick, of Mount Rainier and William, of Arlington, and four grandchildren.