Kyle Edmund's dreams of winning the boys' singles were ended after he lost 6-4 6-4 to Italy's Gianluigi Quinzi in the semi-finals.
The 18-year-old could not reproduce the form he had shown in earlier rounds.
The sixth seed broke in the seventh game of each set, while Edmund failed to win any of his six break points.
Edmund later had the consolation of a win in the quarter-finals of the boys' doubles together with Portuguese partner Frederico Ferreira Silva.
The top seeds were trailing in the first set but hit back to beat sixth seeds Clement Geens and Noah Rubin 7-6 (7-3) 6-3.
In the semi-finals they will play French/Italian pair Enzo Couacaud and Stefano Napolitano, who on Thursday beat the last remaining all-British pair Julian Cash and Joshua Sapwell in the second round.
Couacaud and Napolitano overcame Australian duo Jay Andrijic and Bradley Mousley in their quarter-final.
Edmund was making his third appearance on Court Three when he strode out for his singles match, following his first round defeat to Jerzy Janowicz in the men's singles competition and his boys' quarter-final on Thursday.
There was hardly a seat to be had as the match began in hot sunshine and Greg Rusedski, who has worked with Edmund for many years, was among the crowd.
Edmund had three break points in the sixth game, each of them saved by the 17-year-old Italian, who then broke in the next, which had included a tense 15-stroke rally.
The level of an already high-quality match went up a notch in the following game, which lasted more than 13 minutes and contained nine deuces as well as a code violation warning for Quinzi, who was close to losing his cool.
Edmund had two more break points, but again could not capitalise and the Italian went on to clinch the 43-minute set with an ace.
In Thursday's quarter-final win over Stefan Kozlov, Edmund successfully came from behind after losing the opening set.
This time, however, he was unable to put a pumped-up Quinzi under significant pressure and the Italian, who celebrated key moments with loud yells, broke to lead 4-3 and quickly finished off the 36-minute set to secure his place in the final.
A sign of the respect between the players was shown at the end when the Briton came round the net to congratulate his opponent.