The number of the three British Dan Evans arrived at the Traeth Delray Open in Florida with a 3-6 6-6 6-3 win over the numbers of the world's top John Isner of the US.
The 28-year-old 148-year-old, which returned in April 2018 of a one-year drug ban, is a qualification at the event.
He fights back to defeat Isner, 33 semi-finals Wimbledon last year in an hour and 32 minutes.
In his second ATP final only, he will face a seamless player, either Mackenzie McDonald or Radu Albot.
American McDonald, 23, is the world's 84th highest-hitting Juan Martin del Potro seeds in the last rounds.
Albot from Moldova beat Nick Kyrgios in the 16th round and he's 82.
In his last last ATP two years ago, Evans lost in Sydney International to Gilles Muller.