Perhaps Chang's most famous match took place at the 1989 French Open,
which was Chang's only Grand Slam singles title. In the fourth round,
he faced the World No. 1 and three-time former champion Ivan Lendl.
Conventional wisdom made Lendl the heavy favorite to win the match
against the 15th seeded and 17-year-old Chang.

Everything seemed to be going to form when Lendl comfortably took the
first two sets 6-4, 6-4 and then broke Chang's serve in the opening
game of the third set. But Chang broke back immediately and went on to
claim the third set 6-3. Part way through the fourth set, Chang
experienced a severe attack of leg cramps. Fighting to stay in the
match, Chang resorted to some novel tactics. For a period, he began
taking all speed out of the match by playing "moon balls," he ate
bananas and drank at every opportunity, and left the court for an
extended bathroom break. Lendl, who was known to be one of the calmest
players, lost his rhythm. He began to swear at the umpire and the
crowd, especially after losing a key point in the fifth set when Chang
shocked him by delivering an under-arm serve. Chang later explained,
"I was trying to break his concentration. I would do anything to stay
out there." (That underhanded serve achieved cult status among
amateurs and, at least in Chang's hometown area of Southern
California, it was not unheard of to see juniors emulate the swing in
desperation while trying to come back from behind in a match during
the 1990s.)

Barely able to stand, and screaming with pain after many of his shots,
Chang continued to battle on. Despite being on the verge of physical
breakdown, he fought his way to a 5-3 lead in the fifth set with two
match points on Lendl's serve. Aiming to break Lendl's concentration
one more time, Chang stood well inside the baseline, almost at the T-
line in the centre of the court while waiting to receive Lendl's serve
(normally an almost suicidal position when facing an opponent's
serve). The tactic worked as Lendl produced a double-fault to give
Chang the victory, 4-6, 4-6, 6-3, 6-3, 6-3 in four hours and 37
minutes. Chang sank to his knees and broke down in tears at the
conclusion of the match. Seven days later, he became the youngest male
champion in French Open history.

*****

What's you opinion on Chang's tactics in that final?