Carlos Alcaraz has led Spain to the quarter-finals of the Davis Cup Finals after a straight-sets win over Ugo Humbert. (More Tennis News)

The 21-year-old needed just one hour and 21 minutes to cruise through with a 6-3 6-3 victory, hitting 21 winners to his opponent's 14 as he backed up Roberto Bautista's win earlier on.

Bautista had to come from behind to edge past Arthur Fils, beating him 2-6 7-5 6-3, and converting 40% of his break points, bettering the Frenchman's 27%.

Spain are through in Group B, but elsewhere in Group D, US Open semi-finalist Jack Draper's return was unable to inspire Great Britain to victory.

Dan Evans was beaten by Tomas Martin Etcheverry earlier on Friday before Draper's first match since New York ended in a straight-sets 7-6 (7-4) 7-5 defeat to Francisco Cerundolo.

Despite making fewer unforced errors than the Argentinian (23 to 39), the British number one struggled to find an edge, though Evans and Neal Skupski claimed a consolation win in the doubles to make it 2-1.

They sit second in the group, missing the chance to qualify for the last eight, and now needing a win against Canada, who have been in fine form so far.