Masur, No. 71, Upsets Becker

MELBOURNE, Australia — Wally Masur, an Australian ranked 71st among the world’s tennis players, upset second-seeded Boris Becker 4-6, 7-6 (7-3), 6-4, 6-7 (9-11), 6-2 in the fourth round of the $1.65-million Australian Open tennis championship today.

Masur, not even a regular starter on the Australian Davis Cup team, won the last six games to outlast the two-time Wimbledon champion in a three-hour, 40-minute struggle and advanced to the quarterfinals.