Jenkins lost to Shepherd in the first round of the 2008 PDC World Championship, a result which saw him lose confidence which saw his best form desert him on occasions. He finished 7th in the 2008 Premier League Darts and then suffered a number of early round exits in major tournaments. To add to his poor run of form, Jenkins was knocked out in the first round of the 2008 European Championship Darts, by Carlos Rodriguez of Spain, who was then ranked 91 in the world. Despite not having a great year, Jenkins remained at No. 5 in the world. Jenkins had a good tournament at the 2008 Grand Slam of Darts reaching the final of the event before losing 18–9 to Taylor.