text: Chang 's most famous match took place at the 1989 French Open ( on the way to winning his only Grand Slam singles title ) . In the fourth round , he faced the World No. 1 , reigning Australian Open champion , and three-time former French Open champion Ivan Lendl .
simplified: When he won the French Open in 1989 , Chang had a very famous semi-final match with Ivan Lendl .