Tom Seaver, making a record 15th opening-day start, allowed five hits over 6 2/3 innings to help the Chicago White Sox to a 4-2 victory over the Brewers yesterday in Milwaukee.

Seaver struck out three and walked one in improving his opening-day record to 7-1. Walter Johnson had 14 opening-day assignments.

Of the record, Seaver said, "I'm very proud of it. It's terrific when you talk about doing something that no other pitcher in the history of the game has done. If we had been here now as a losing ballclub, I wouldn't feel that way."

The White Sox capitalized on two errors by second baseman Jim Gantner to score twice in the first inning. Milwaukee committed five errors.

Rudy Law reached first when Gantner dropped a pop fly near the right field line. Starting pitcher Moose Haas, who took the loss, then walked Harold Baines and Greg Walker lined a single to center to drive in Law and advance Baines to third.

Ron Kittle's grounder forced Walker at second, but Baines scored when Gantner's hurried throw to first pulled Cecil Cooper off the bag. Gantner misplayed Luis Salazar's grounder before Haas got Daryl Boston on a pop-up for the third out.

Chicago added another run in the fourth when Boston opened the inning with a double to center, went to third on Marc Hill's sacrifice, and raced home on Julio Cruz's sacrifice fly to center.