Wimbledon champion Boris Becker teamed with Andreas Maurer yesterday to defeat Ivan Lendl and Tomas Smid in straight sets and put West Germany in the Davis Cup final against defending champion Sweden.

West Germany took an insurmountable 3-0 lead over Czechoslovakia in the semifinal in Frankfurt with Becker and Maurer's 6-1, 7-5, 6-4 doubles victory.

The West Germans, who beat the United States in the quarterfinals, will face Sweden, Dec. 20-22, either in Munich or Dortmund. Sweden took an unbeatable 3-0 lead over Australia in Malmo, Sweden.

Lendl, the world's No. 1 player, did not play singles because of an arm injury and was obviously bothered by it in doubles. In the first game of the third set, his serve was broken for the third time. The Czechoslovaks broke Becker for the first time in the next game. The match went on serve until the seventh game, when West Germany broke Smid for a 4-3 lead. Maurer held and Becker served out the match.

"I have seen Lendl play much better and he is not so good in doubles as in singles," Becker said.

Sweden clinched its spot when Anders Jarryd, the No. 1 doubles player in the world, teamed with Stefan Edberg to beat Mark Edmondson and John Fitzgerald, 6-4, 6-3, 6-4 . . .

Top-seeded Martina Navratilova struggled to beat Terry Phelps, 6-1, 5-7, 6-3, in a rain-delayed quarterfinal, then three hours later defeated Peanut Louie, 6-2, 6-1, in the Lynda Carter-Maybelline Tennis Classic in Fort Lauderdale, Fla. Navratilova plays second-seeded Steffi Graf, who stopped third-seeded Bonnie Gadusek, 6-3, 7-6 (7-3) . . .

Virginia Wade was named to head a British team of Annabel Croft, Jo Durie, Ann Hobbs and Sara Gomer against the United States in the Nabisco Wightman Cup matches at Williamsburg, Va., Oct. 31-Nov. 2.