FORMER champion Boris Becker survived five match points only to

surrender on the sixth as Richey Reneberg knocked out the seventh seed

in a dramatic fifth-set tie-break at the US Open.

''This was the best tennis I ever played in my life in the fifth set.

There's no way I could play any better,'' said Reneberg.

''No match I have ever been involved in compares to it,'' added the

28-year-old American, who has never been past the second round at the

final Grand Slam event.

Becker made the earliest exit of his 10-year US Open career to join

second seed Goran Ivanisevic on the sidelines on an opening day that

began and ended with stunning upsets.

Ivanisevic, the world No.2 and Wimbledon runner-up, who has never

played well on the hardcourts of Flushing Meadow, opened the first-day

programme by falling to Germany's Markus Zoecke 6-2, 7-5, 3-6, 7-5.

By the time Becker had a chance to get used to the soft balls and slow

court conditions, the three-times Wimbledon champion was already in

trouble, two sets behind, and Reneberg found enough of his sparkling

early form again in the fifth set to pull out the 6-1, 6-4, 4-6, 1-6,

7-6 (7-5) shocker.

Britain's Jeremy Bates went out in five sets to unfancied Venezualan

Maurice Ruah. Bates won the first set, but the 23-year-old from Caracas

hit back to seal a 6-7 (3-7), 7-6 (7-5), 6-4, 2-6, 6-4 success.

There was only one minor upset in women's play when twelfth-seed

Sabine Hack of Germany lost 6-2, 2-6, 7-6 to America's Gigi Fernandez.

World No. 1 Steffi Graf crushed 19-year-old American wildcard entrant

Anne Mall 6-2, 6-1 in 45 minutes. The top-seeded German showed no signs

of the back trouble that has hampered her this summer by powering 21

winners against Mall.

''Maybe, in the middle of last week I wasn't sure I could play,'' Graf

said. ''But I started practising on Friday and it's been great.''

Joining Graf in the second round was fifth-seeded Kimiko Date of

Japan, a 6-0, 6-2 winner over compatriot Rika Hiraki, and Germany's

Barbara Ritter, who beat Holland's Manon Bollegraf 6-2, 6-1.