Rafael Nadal will return to action in the Davis Cup.
The victor of the Valencia quarter-final will face either defending champions France or Italy for a place in the final.
ITALY 1, FRANCE 3 Venue: Valletta Cambiaso ASD, Genoa, ITA (clay - outdoor) Lucas Pouille came from a set down to send France into the semi-finals, defeating Fabio Fognini 2-6, 6-1, 7-6 (3), 6-3. "It was a great match for me in an unbelievable atmosphere".
Nadal was dominant against the 20-year-old German to earn his 24th straight win since 2005, the most in Davis Cup history combining singles and doubles. It's a great feeling and very unique to play here in front of my people.
Spain is trying to extend its winning streak at home to 27 ties.
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The French doubles team - boasting the ATP's ninth-ranked doubles player Nicolas Mahut alongside Pierre Hugues Herbert - raced to victory in straight sets, defeating Italy 6-4 6-3 6-1.
Kohlschreiber also went down tamely in the second set, before putting up more of a fight at the start of the third, but 16-time Grand Slam victor Nadal was relentless and wrapped up the match. "He made this a huge thing, like in football sometimes where the guy you don't touch still collapses", Chardy said. "I am playing not just for me but also for Italy".
Spain joined the USA, France and Croatia in the semi-finals of the Davis Cup after a dramatic comeback on the final day in Valencia.
World No. 3 Marin Cilic, meanwhile, put the finishing touches to Croatia's 3-1 win over Kazakhstan.
Americans Jack Sock and Ryan Harrison rallied from a set down in a tight doubles rubber to ensure the United States became the first team to advance to the Davis Cup semi-finals on Saturday with a 3-0 victory over Belgium in Nashville, Tennessee.
Isner needed three hours and 14 minutes to dispose of world number 319 Joris de Loore 6-3, 6-7, 7-6, 6-4, while world No 14 Querrey beat 110th ranked Ruben Bemelmans 6-1, 7-6, 7-5 in a two-hour long second rubber.