Uzbekistan's Denis Istomin beat eighth seed Martin Klizan of Slovakia 6-1 6-2 in another upset.
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2.
Cliburn had succeeded in previous competitions, notably the prestigious Leventritt, whose winners had included Eugene Istomin, Alexis Weissenberg and Gary Graffman.
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3.
He will play big-serving Kevin Anderson in the Sydney semifinals after the 36th-ranked South African beat Uzbekistan's Denis Istomin 6-4 6-3.