Peter Doohan, an Australian former tennis professional who became known as the Becker Wrecker after upsetting Boris Becker at Wimbledon in 1987, died on Friday. He was 56.

His death was confirmed by Tennis Australia, which did not say where he died. Doohan was told nine weeks ago that he had a particularly aggressive form of what is known as Lou Gehrig’s disease.

July 1 was the 30th anniversary of his victory over Becker in the second round at Wimbledon, which was then considered one of the biggest upsets in the tournament’s history.

Becker had won two straight Wimbledon titles and was ranked No. 1, while Doohan was ranked No. 70. Doohan won, 7-6, 4-6, 6-2, 6-4. Becker posted online Saturday: “RIP mate! You were the better player.”