Nadal broke Isner's serve in the 9th game of the first set, which was the only break for the two players during the 104-minute fight.
Goffin will next meet Argentine eighth seed Diego Schwartzman who eased past Steve Johnson of America 6-0, 7-5.
There were frequent flashes of brilliance from Nadal early on, but the match really sprung to life as Dimitrov responded impressively to a nightmare start in the second set.
White House Believes John Kelly's Cellphone Was Hacked, Says Report
Staffers revealed that many phone functions were not working, and the IT department said the handset should not be used further. It's unclear why Kelly spent so long with a messed up phone, and what data if any would have been obtained from the device.
"It was a tough match, he's one of the best players in the world right now", Kyrgios said of his vanquished opponent, ranked four in the world. But Halep dominated the first set, breaking Ostapenko's serve in the first game at love.
"My dream is true now, in that moment you can not believe 100 percent that it's happening, so I was in tears a little bit", she said.
The 16-times grand slam victor will take on Australian Nick Kyrgios in Sunday's final as the eighth seed progressed to his first final of the season after beating German second seed Alexander Zverev 6-3 7-5 in the last four. "I played a great first set, in my opinion". So I'm very happy. I saw his match today. I don't know how many I had. "It's never easy. I need to, right now, just stay positive and take the positives out of it".
Nevertheless, the match will be mostly remembered for a point in the second set tie-break. 'I think it was just a hair or something, a hair from the tennis ball. "He played huge. So let's see what's going on tomorrow".