The South African moves into the quarterfinals in Washington.
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The Spaniard won the epic match that lasted more than 3 hours.
The American moves into the round-of-16 at the Citi Open
The two-seed will face the up-and-coming Jenson Brooksby next
The American hopes to keep the momentum heading to the US Open
The world number one will face Karolina Pliskova in the final
The American will face twenty-fifth seeded Karen Khachanov next
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