Dee ihe na-esote paragraf a - Allen enweghị ike iru ngwụcha na ọkara mbụ nke oge, ọ tụfuru na ọkara ikpeazụ isii ọ ruru. Na International Championship na Shanghai Masters Allen meriri Shaun Murphy, na English Open megide Mark Selby na Champion nke ndị mmeri meriri Judd Trump. N'asọmpi UK, Stephen Maguire gbapụrụ ya. Mgbalị Allen iji nwetaghachi aha ya na Scottish Open na 2018
biri na mkpebi nke egwuregwu ọkara ikpeazụ megide Jack Lisowski. N'asọmpi iko mba ụwa, Allen mere ka ọ bụrụ onye mere narị ise n'asọmpi nke mbụ megide Jamie Clarke; agbanyeghị, ọ gara n'ihu merie asọmpi ahụ megide Welsh nọmba 89 - onye ọkpụkpọ kachasị ala na asọmpi ahụ - 8-10. O mechiri oge ahụ ebe o mechiri nke gara aga, ebe ọ nọ n'ọkwa 5.