Baseball Commissioner Peter Ueberroth has distributed a letter to all major league players that states drug testing will take place only during the next two years with four urinalysis samples being submitted between March and October, it was reported last night.

According to United Press International, players received copies of the five-page letter yesterday. Ueberroth's office announced the letter had been distributed and that he is scheduled to make the details of the drug-testing plan public Monday.

According to the letter, doctors will look for traces of marijuana, cocaine, morphine and heroin. The commissioner's plan includes players, umpires and all full-time front-office personnel.

Ueberroth told the players in the letter there will be no penalty for players who test positive for drugs the first time. The results will be kept between doctor and player, and management and the commissioner will not have access to them. AUTO RACING

Mario Andretti took the pole for the Dana 200 in record-setting time and Michael Andretti also broke the track record in Phoenix to set up a father-son start unprecedented in Indy-car history.

Andretti toured the one-mile oval at Phoenix International Raceway in 21.716 seconds, with an average speed of 165.776 mph. The old record was 22.238 seconds and 161.885 mph set by Al Unser in taking the pole at the Phoenix 150 last season.

In taking the 54th pole of his career, Mario Andretti moved past A.J. Foyt into sole possession of first place for most poles in a career . . .

In stock cars, Morgan Shepherd won the late model sportsman Budweiser 200 at the Bristol (Tenn.) International Speedway, with Dale Earnhardt second. For today's Grand National Valleydale 500, Geoff Bodine has the pole. TENNIS

Chris Evert Lloyd beat Bonnie Gadusek, 6-1, 6-1, in the semifinals of the $150,000 Tournament of Champions and will meet Claudia Kohde-Kilsch, a 6-4, 4-6, 6-2 winner over Janine Thompson, in today's final in Marco Island, Fla. BOXING

At the U.S. amateur championships in Beaumont, Tex., Michael Moorer of New Carrollton won the 156-pound division, using an excellent right jab to defeat Thomas Tate of Houston, 3-2. Tate's brother, Frank Tate, was the 156-pound Olympic champion.

Michael Collins of LaPorte, Tex., retained his 119-pound title with a 4-1 victory over Jemal Hinton, a 16-year-old high school junior from New Carrollton. COLLEGES

The NCAA is conducting an investigation into the way Cleveland State attempted to recruit current Washington Bullets center Manute Bol in 1983, a university official said.

Cleveland State Coach Kevin Mackey, acting on a tip from a friend, brought Bol to the United States from Sudan. Bol failed to meet Cleveland State's academic requirements and never enrolled, ending up at Bridgeport instead. LOCALLY

Tickets for the fifth annual National Old Timers Baseball Classic June 23 at RFK Stadium will go on sale Monday. They are available at the RFK ticket office and local Ticket Center outlets.