Oliver Golding's first senior appearance at Wimbledon ended in disappointment as the Briton lost to Russia's Igor Andreev after a spirited display on Court Two.
Golding, ranked 398 places below world number 93 Andreev, stunned his opponent with a series of powerful shots to take the first set with ease.
But he grew increasingly frustrated as the match went on and the man from Moscow ran out a 1-6 7-6 (7/4) 7-6 (9/7) 7-5 winner.
Golding, 18, showed exactly why he is being tipped for big things with some impressive play which was lapped up by the home crowd, but the US Open junior champion will have to deal with his frustrations in a more controlled manner if he is to live up to his potential.
Golding, from Richmond, double-faulted twice to gift Andreev the first game, but he broke back immediately and then moved 3-1 ahead after his opponent also double-faulted.
Golding broke again in the sixth game with a fierce backhand winner and showed no signs of nerves as he served out for the first set after just 29 minutes.
There was a show of supreme confidence from Golding to drop a dummy lob just over the net early in the second set, but Andreev started to return better and the home favourite started to get annoyed, at one point shouting "that was so bad" after missing a routine forehand.
Golding's frustration boiled over in the second set tie-break when he netted two routine forehands on his own serve. The teenager responded by throwing his racquet on to the turf and he then went on to lose the set.
Golding held to love twice in the third set but he could not break his solid opponent and a second tie-break came.
Golding broke his opponent twice to earn a set point but he nervously double-faulted.
Andreev seized the initiative and Golding wilted under pressure, allowing the Russian to claim the set after mis-judging a charge to the net.
A marathon sixth game of the fourth set saw Golding offer Andreev four break points but the Russian could not convert any of them, and he also spurned another opportunity in the Englishman's following service game.
Two double-faults from Golding allowed Andreev one match point and the Russian did not waste it, forcing Golding to net with a tired backhand.