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The Spaniard, who is yet to fully recover from a hip injury, won 6-2, 6-2, 6-3 in just over two and half hours in Valencia, stretching his winning streak in Davis Cup singles to 23 matches.
The victory in the Plaza de Toros bullring levelled the tie after Alexander Zverev beat David Ferrer 6-4, 6-2, 6-2 in the opening rubber.