Zverev assumed top ranking after the late
withdrawal of Rafael Nadal and he had not lost a set all week.
But Del Potro, who has won 16 of his 20 career titles on hard
courts like the one in Acapulco, dominated his higher-ranked
opponent in a match that lasted just 90 minutes.
The Argentine never lost a break point all night and hit only
one double fault.
In Saturday's final, he will take on fifth seed Anderson, who is
on track for a second consecutive title after winning the New
York Open two weeks ago.
Anderson, who is enjoying one of the finest spells of a long and
solid career that has brought him four titles, used his height
and power to serve 18 aces against Donaldson.
The South African also hit more than double the number of
winners against his opponent - 37 to 17.
"I really felt I did well just fighting as hard as I could," he
said in a courtside interview.
"The match point felt great to really go after it and execute
the way I wanted to."
(Additional reporting by Andrew Both and Andrew Downie; editing
by Sudipto Ganguly)
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