Noah Lyles has taken one step closer to his dream of achieving an individual Olympic sprint double in Paris after securing his spot in the 200m final at the Stade de France.
To add to American delight, another United States pace merchant, Quincy Hall, came from nowhere to grab victory in an electrifying finish to the 400m.
Lyles claimed 100m gold by five one thousandths of a second on Sunday night, and needed to finish in the top two from semi-final heat two to automatically book his place in Thursday night's showdown.
Lyles crossed his fingers with a tongue-out grin as the camera cut toward him on the big screen.
Like that 100m final, Lyles got out to the slowest start of the eight-man field, but made up for it when he crossed the line in 20.08 sec for second spot behind Botswanan Letsile Tebogo in 19.96.
Lyles' time was still good enough for third-fastest of the semi-finalists behind Tebogo, the only man to clock a sub-20 time in the semis.
Second quickest was Lyles' American team-mate Kenny Bednarek, the 2022 world and Tokyo 2020 silver medallist, who made easy work of the first semi-final in exactly 20 seconds.
Dominican Alexander Ogando and a third American, Erriyon Knighton, rounded out the top five while Liberia's Joseph Fahnbulleh and Zimbabwe duo Tapiwanashe Makarawu and Makanakaishe Charamba also qualified.
Shortly afterwards, Hall produced a sensational finish to win Olympic 400m gold which denied Britain a first gold in the event in a century.
Hall, the world championship bronze medallist, trailed into the home stretch but then exploded and caught the leading Matthew Hudson-Smith right on the line for victory in a personal best 43.40.
Hall is the first American since LaShawn Merritt in 2008 to capture gold in the one-lap race. His victory came an evening after American Cole Hocker came from far behind late to beat the favourites in the men's 1500m.
Hudson-Smith lowered his European record to 43.44 but it was only good enough for silver. He had been bidding to become the first British man to win the 400m since Eric Liddell in 1924, also in Paris.
The bronze went to Zambia's Muzala Samukonga in 43.74 as five men dipped below 44 seconds They included Grenada's Kirani James who had won gold in 2012, silver in 2016 and bronze at Tokyo 2020 before coming fifth.
