Kammala jumla mai zuwa: Kaymer ya zo kusa da karɓar nasararsa ta uku a wannan shekara a Alfred Dunhill Links Championship, amma ya fadi ga Robert Karlsson a wasan wasa uku wanda ya hada da Ross Fisher. Kaymer ya sake yin rikodin na biyu a Volvo Masters, ya gama bugun jini biyu a bayan mai nasara Søren Kjeldsen. Kaymer ya sami € 1,794,500 a cikin 2008 kuma ya gama na 8 a kan Dokar Merit. Kaymer ya rasa zabin da aka yi masa don
2008 Ryder Cup, amma kyaftin din Turai Nick Faldo ya gayyaci Kaymer don taimaka wa ƙungiyar Turai a matsayin wanda ba ya wasa wanda Kaymer ya karɓa. Kaymer ya wakilci kasarsa a gasar cin kofin duniya ta Omega Mission Hills ta 2008 tare da Alex Čejka. Ma'auratan sun gama a matsayi na biyar.