Jim Spencer hit a three-run homer in the first inning and Tommy John became the American League's first 10-game winner as the New York Yankees beat the Oakland A's, 5-3, today for their ninth consecutive victory.

Spencer, who drove in five runs Friday night, hit his fifth home run off Mike Norris after Graig Nettles singled with two out and Reggie Jackson walked.

The Yankees' only other hit, until Nettles led off the eighth with his 11th home run, was Bobby Murcer's RBI single in the second after Norris issued walks to Bobby Brown and Willie Randolph. Oakland out-hit the Yanks, 9-5.

John allowed nine hits in 7 1/3 innings before Rich Gossage retired pinch hitters Dave Revering and Wayne Gross with two runners on base and went on to earn his 10th save.

An Old-Timers' Day crowd of 51,598 saw the A's, managed by former Yankee pilot Billy Martin, lose their fifth game in a row.

Martin, who vowed he would never again wear a Yankee uniform after being dismissed as manager for the second time last fall, nevertheless appeared in the familiar pinstripes. He received a two-minute standing ovation.

Martin, who did not play in the two-inning exhibition, acceded to a public request by Yankee owner George Steinbrenner to appear in his Yankee uniform.

Oakland Coach Clete Boyer, another former Yankee, joined Martin and 23 other former Yankees including Joe DiMaggio, Mickey Mantle, Yogi Berra, Whitey Ford, Phil Rizzuto and Roger Maris.

Also honored in pregame ceremonies were widows of team captains Lou Gehrig and Thurman Munson.