Cameron Norrie suffered a second-round knockout to Chris Eubanks to end his Wimbledon hopes.
The British number one was left dazed by American Eubanks' powerful hitting and his haymaker of a serve in a punishing 6-3 3-6 6-2 7-6 (3) defeat.
In a heavyweight start to the contest, the first 20 points all went with serve including nine aces, seven from the arm of Eubanks.
And it was the world number 43 who landed the first blow, breaking Norrie to love on his way to taking the opening set.
Norrie, the 12th seed and a semi-finalist last year, had barely laid a glove on his opponent, winning just three points on the Eubanks serve.
But the South-African-born southpaw hauled himself off the canvas and secured an early break in the second set to level the match.
However, Norrie has looked ring-rusty in recent months and Eubanks, a grass-court title-winner in Mallorca in June, took advantage by breaking twice for the third set.
Eubanks dropped his guard in the fourth, losing his serve to love, but he hit back for 4-4 to leave Norrie on the ropes.
Norrie survived a match point on serve when a Eubanks forehand thudded into the net.
But Eubanks was too strong in the tie-break, a quick one-two of a booming forehand and delicate volley leaving Norrie out for the count.
