Top-seeded Martina Navratilova equaled her record of five Avon championships in one year by defeating Mima Jausovec, 6-3, 6-2, to win the $200,000 Avon Championships of Dallas. The victory extended Navratilova's winnning streak to 24 matches in 1982.

Navratilova, 25, has won every Avon tournament she has entered this year. However, she has yet to face No. 1 Chris Evert Lloyd or No. 3 Tracy Austin, who is out with an injury . . .

Top-seeded Ivan Lendl defeated fellow Czechoslovakian Tomas Smid to capture the $300,000 Munich Open, 3-6, 6-3, 6-1, 6-2. Lendl, who had not lost a set in the tournament until the final, collected $100,000 for the victory, his 10th tournament title since September. Smid, who has not beaten Lendl in tournament play since the second round of the Frankfurt Open last year, earned $32,000.

In Brussels, Vitas Gerulaitis won the Belgian International indoor championships, beating Mats Wilander, 4-6, 7-6, 6-2. The unexpected final matchup, played before the king and queen of Belgium, came after the top two seeded players, John McEnroe and Jimmy Connors, were surprisingly eliminated; McEnroe suffered an injury and Connors was ousted by Gerulaitis.