Liam Broady's run at the Miami Open was ended in the second round by Serbia's Filip Krajinovic.
The Briton, ranked 169th in the world, lost 6-3 6-2 to the 22nd seed in 71 minutes.
The 26-year-old had progressed through qualifying and overcame America's Bjorn Fratangelo in the first round, but Krajinovic proved too strong.
Krajinovic will go on to play either compatriot Novak Djokovic or France's Benoit Paire next.
Elsewhere in Miami, seventh seed David Goffin was beaten in straight sets by Portugal's Joao Sousa.