John Isner has extended his reign of serving dominance to reach his seventh Atlanta Open final in eight years, trouncing third-seeded Gilles Muller 6-4 6-2.
The second seed will face fourth-seeded Ryan Harrison in an all-American final on Sunday.
Isner lost to Australia's Nick Kyrgios in the decider last year after winning the hard-court event three straight years.
But the 32-year-old has been in rich form this month.
After reacing the Wimbledon quarter-finals he won the grasscourt Hall of Fame Open last week in Newport, Rhode Island, for his 11th career title - all at the ATP World Tour 250 level.
He has won seven consecutive tour matches and held for 69 straight service games.
Harrison beat fifth-seeded Kyle Edmund of England 6-7 (5), 6-3, 6-4. Harrison won the Memphis Open in February for his first career title. Edmund beat top-seeded Jack Sock on Friday night.
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