Tim Belcher, a right-handed pitcher from Mount Vernon (Ohio) Nazarene College, was the first player chosen yesterday in the first round of the regular phase of major league baseball's summer free agent draft.

The 6-foot-3, 215-pound junior, with a fast ball clocked faster than 90 mph, was picked by the Minnesota Twins and was one of 10 right-handed pitchers chosen in the first round. Belcher was 5-4 this season with a 2.86 ERA and 93 strikeouts in 66 innings. He pitched a no-hitter and two one-hitters.

The Cincinnati Reds, selecting second, picked shortstop Kurt Stillwell of Thousand Oaks, Calif. He was one of 10 high school seniors chosen in the first round of the regular phase. A switch-hitter, Stillwell batted .552 this spring. The Reds announced that he had signed less than 30 minutes after he was drafted.

The only Washington-area player selected in either the regular phase or the secondary phase (players drafted previously but not signed) was Richard Sauveur, taken by Pittsburgh in the fifth round. The rangy left-hander pitched at Falls Church High School, then two years at Manatee Junior College in Florida and had planned to transfer this fall to James Madison for his junior year.

The Texas Rangers, with the third choice, took Rider College shortstop Jeff Kunkel, son of veteran American League umpire Bill Kunkel. The New York Mets then took third baseman Eddie Williams, who batted .434 and hit nine homers for Hoover High School in San Diego, and the Oakland A's selected pitcher Stan Hilton of Baylor.

The Chicago Cubs, picking sixth, selected Jackie Davidson, a right-handed pitcher from Everman (Tex.) High School and the Seattle Mariners used one of their first-round picks on pitcher Darrel Akerfelds of Mesa College in Colorado. The Mariners used their other choice to take Terry Bell, a catcher at Old Dominion, in the 17th round.

The eighth team to choose was the Houston Astros, taking Robbie Wine, a catcher from Oklahoma State and the son of Bobby Wine, former shortstop and now coach for the Philadelphia Phillies.

The Baltimore Orioles, with the 25th pick, selected Wayne Wilson, a right-handed pitcher from Redondo (Calif.) High School. In the second round, they took left-handed pitcher Michael Conley of Hamilton, Ohio.

The Twins also had the first pick in the secondary phase of the draft and used it on outfielder Oddibe McDowell, who had seven home runs and 50 RBI in 63 games as Arizona State gained the College World Series.

The Orioles selected four players, three of them pitchers, in the secondary phase. They took Richard Rice of Lantana, Fla., in the first round; Robert Milacki of Lake Havasu City, Ariz., in the second and Alan Sontag of North Massapequa, N.Y., in the third. Chris Courtright, an outfielder from Blackwood, N.J., was taken in the fourth round.

The rest of the regular phase's draft will be conducted today and Wednesday, with the results released June 14.