In the 100m final at the AAA Track and Field Championships in Bedford, Wisil was pipped on the line by Diani Walker of the Birchfield Harriers athletics club after leading from the gun, having to settle for second place in a time of 11.49 seconds.
Coach Tony Fairweather said Wisil ran well but just dipped too soon at the finish.
In Sunday’s 200m, the Pacific Games champion placed third with a time of 23.96 seconds.
Meanwhile, Ephraim Lerkin and Rellie Kaputin arrived in London on Sunday with coach Dior Lowry after a 34-hour journey from Nadi.
Lerkin earned his place in the team by winning the 400m hurdles at the Oceania Championships and will compete in this event on August 6.
Kaputin only learned ten days ago that the IAAF had accepted her nomination to take part in long jump, as the process for field event athletes qualifying through Area Championships is more rigorous.
“In field events, the area champions are not automatically accepted like in the sprints,” said Athletics PNG President, Tony Green.
“The IAAF technical delegates will say yes or no after considering the standard of the athlete against the rest of the athletes who have nominated for that event.
“Rellie has remained focused and stayed in Fiji after the Oceania Championships to prepare for the World Championships, as did Lerkin.”
The 2017 IAAF World Championships are the 16th edition and will be held in London, United Kingdom, from August 4-13.