The Player Relations Committee proposed yesterday that the Major League Players Association accept a freeze in benefits, salaries and pensions.

Not surprisingly, the union doesn't like the idea. One union source called it "pathetic."

The PRC said it would present "a new comprehensive proposal" May 20 and would provide further details about Commissioner Peter Ueberroth's drug test plan . . .

No major league umpire has ever been charged in a drug case but all will take drug tests, said Richie Phillips, executive director of the Major League Umpires Association. He said the association's executive board agreed unanimously to join the testing program. He called mandatory testing "an invasion of privacy," but said, "The umpires balanced that infringement against the need that all of baseball remain above reproach and suspicion" . . .

The New York Yankees finished their series in Kansas City Sunday, but two of them are supposed to return for court appearances. First baseman Don Mattingly and third baseman Dale Berra are accused of urinating publicly at County Club Plaza, in which one of the Yankees coaches, Lou Piniella, owns a tavern. Mattingly received a municipal summons Thursday and Berra was arrested on Saturday, according to police records. Berra is also charged with trying to strike a security officer, according to the Kansas City Police Department.

Right fielder Darryl Strawberry of the New York Mets had a torn ligament in his right thumb repaired and won't be able to swing a bat for six weeks. Outfielder Terry Blocker, from AAA Tidewater, has taken his roster spot, but the Mets plan to platoon Danny Heep and John Christensen until he recovers . . .

The St. Louis Cardinals, pleased with rookie outfielder Vince Coleman, are trying to trade $850,000-a-year outfielder Lonnie Smith to the Kansas City Royals for outfielder John Morris from the Royals' AAA farm in Omaha. Morris was a No. 1 draft pick in 1982 . . .

Joe Pepitone, former major league first baseman, is free on bond after pleading not guilty to drug and weapons charges. "It ain't so," he told reporters. "I'm innocent" . . .

Georgetown will play Connecticut in the first Big East baseball championship at Bristol, Conn., Thursday. The Hoyas, 27-23 overall and 8-16 in the Big East, qualified by finishing second to Seton Hall in the South Division. Seton Hall will play St. John's in the other first-round game of the double- elimination tournament.