A barrage of 23 aces could not save former Miami Masters winner John Isner from steady Spaniard Roberto Bautista Agut as the American went down 6-3, 4-6, 7-6(7) on Tuesday in the fourth round.
Seventh-seeded RBA salvaged a match point in the deciding set tiebreak to move into the last eight here.
Isner lost a Miami tiebreaker for the first time after standing 11-0 in local deciders over 12 main draw appearances.
“John always makes matches difficult,” Bautista Agut said. “He has a very big serve and a lot of power from baseline with the forehand.”
The Spanish winner will now face either top seed Daniil Medvedev or Frances Tiafoe of the US.
““I played a brilliant (first) set, but with John you feel you always under pressure,” Bautista Agut said.
“It was a really tough fight until the last point.”
RBA holds nine career titles and will be competing in his third quarter-final of the season after finishing runner-up in Montpellier and January’s ATP Cup for Spain.
The usually calm Bautista Agut let rip with a string of obscenities at an apparently rowdy spectator, telling the man off from the court.
During the outburst, the seventh seed invited the member of a limited COVID-era audience to come down to the court to settle the matter after the man jeered Bautista Agut’s mistakes.
The second-set incident at 5-4 to Isner quickly died down, with play continuing and RBA completing his win.
Main photo:- Roberto Bautista-Agut beating John Isner in Miami – by ATPTour.com