Andy Murray recovered from his win in the early hours of Thursday to beat Spanish wildcard Marcel Granollers and reach the Madrid Masters last eight.
The British number one recorded a 6-2 6-0 victory in his second match of the day, having started the tie against Philipp Kohlschreiber after midnight.
The 27-year-old number two seed is set to face either fifth seed Milos Raonic of Canada or Leonardo Mayer in Friday's quarter-final.
The Scot won the Madrid title in 2008.
More to follow.