King qualified fastest for the 110m hurdles final with an impressive 13.74 second run from lane eight in Friday morning’s heats.
His Great Britain team-mate and World Junior silver medallist, David Omoregie, was second quickest having won his heat in 13.84.
The GB pair were boosted going into the heats when World Junior champion Wilhem Belocian pulled out.
After his opening run in wet weather, King said: “That was really good. I’ve had a few bad races, such as British Champs, but that was really good and I’m very happy with it. I love this weather!
“Some people hate it but in Plymouth it rains all the time so I’m used to it. With the semi-finals cancelled we’re straight into a final and I feel really confident.”