Top-seeded Simona Halep was forced to retire due to heat exhaustion while losing her quarterfinal match against Ekaterina Makarova at the Citi Open on Friday at Washington.
On-court temperatures reportedly soared up to 116 degrees and Halep withdrew after losing the first game of the final set, giving Makarova a 2-6, 6-3, 1-0 victory that pushed the Russian into Saturday's semifinals.