That left the field clear for the stocky Coleman, who stormed out of the blocks and rapidly put clear daylight between himself and the rest of the field.
He backed up a scorching semi time of 9.96 with a 9.99 run in the final, leaving Michael Rodgers a distant second in 10.12 while Christopher Belcher was third.
Coleman will now head to the worlds in Doha as the man to beat in sprinting's blue riband event. "It feels great," Coleman said after the win. "The whole goal throughout the year was to make the team. The mission's not over.
"I came into the year wanting to win a gold medal in Doha, and this was just a step on the way to get there."
"It felt smooth. No complaints here," added Coleman, who's planning to also run the 200m. "I feel like I pretty much controlled it from the start."
Asked if he was bummed not to see 37-year-old Gatlin in the final, Coleman said: "Not really. I just wanted to make the team."
FASTEST 100M TIMES — 2019
9.81 — Christian Coleman (US), Palo Alto, California, June 30
9.86 — Noah Lyles (US), Shanghai, China, May 18
9.86 — Divine Oduduru (Nigeria), Austin, Texas, June 7
9.87 — Justin Gatlin (US), Palo Alto, California, June 30