British number 2 Jack Draper was knocked retired of nan Miami Open successful nan 2nd information pinch a 7-6 (7-3) 7-6 (7-0) conclusion by Reilly Opelka.
The 24-year-old mislaid 2 tie-breaks to nan big-serving American, who wrapped up nan triumph wrong 93 minutes.
Draper had headed into nan tourney aft an impressive tally to nan quarter-finals astatine Indian Wells - featuring a triumph complete Novak Djokovic - pursuing astir 8 months retired pinch an limb injury.
However, he struggled against nan powerful 6ft 11in Opelka, classed 67th successful nan world, who fired down 25 aces and 47 winners.
Defeat leaves Draper astatine consequence of slipping further down nan rankings going into nan clay-court play having surrendered his spot arsenic British number one to Cameron Norrie this week.
Elsewhere, Katie Boulter progressed to nan 3rd information astatine Miami Gardens erstwhile Denmark's Clara Tauson retired during their lucifer done injury.
The British number 3 fto a 5-3 lead gaffe arsenic Tauson won nan first-set tie-break 7-4, earlier she battled backmost to return nan 2nd group 6-4.
Boulter won nan first crippled of nan 3rd group only for Tauson to determine she could not continue.
"It was a complete conflict - immoderate disfigured tennis and disfigured conditions arsenic well, but you person to find a way," Boulter said.
"Unfortunately she couldn't decorativeness but it is what it is. It's ne'er nan measurement you want to win, but happy to beryllium done to nan adjacent round."
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