Middleweight James Degale lifted the gloom which must have descended on Team GB by outclassing American Shawn Estrada in their round of 16 match by 11-5.
A cagey opener wasn't complete bereft of action yet ended 0-0.
Two left hands put Degale 2-0 in front and then the pair exchanged blows to score simultaneously, making the tally 3-1 at the end of the second round.
Estrada looked like a plodder by the third and Degale got on his toes, edging ahead 6-3 which looked a comfortable enough margin to progress.
Degale showed his class in the last, easing to 8-4 and then impressively racked up a few scoring shots in as many seconds, turning 8-4 into 11-5.
The Hammersmith man is now only one win away from a guaranteed medal.