The day ended with an impressive performance from 18-year-old Argentine Juan Martin del Potro, who beat Swedish veteran Thomas Johansson 6-2 6-4.

BBC: Bogdanovic and Baker go through

Second seed Nadal faces former world No. 3 David Nalbandian in Friday's quarterfinals following three-time champion Roger Federer's clash with another Argentine, ninth seed Juan Martin del Potro.

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Nalbandian's win in Washington is the third straight title for an Argentine, following consecutive tournament wins by his compatriot Juan Martin Del Potro.

BBC: Nalbandian beats Baghdatis in Washington final