In 2018, Herbert began playing the European Tour via sponsor exemptions, finishing 47th on the Race to Dubai and ending the year in the world top-100. He was runner-up in the Portugal Masters and was third three times including the Sky Sports British Masters. A good result in the SMBC Singapore Open gave him an entry into the 2018 Open Championship where he made the cut. He also qualified for the 2018 U.S. Open but missed the cut.