 Dennis akasvika kumagumo eWorld Championship muna 1927, 1929, 1930, uye 1931, asi akarohwa nguva dzose naJoe Davis. Dennis akasvika pedyo zvikuru nokukunda Davis akanga ari mumutambo wa1931, apo vaviri vacho vakanga vari vaviri bedzi vakapinda. Mutambo, wakaitirwa muimba yekumashure yebhawa rake muNottingham, wakaona Dennis achitungamira 14-10 uye 19-16, asati atadza 21-25. Akakwikwidza mumimwe mitambo miviri, achiita chitarisiko chake chokupedzisira muna 1933. Akasvikawo kumagumo emutambo muna 1927, achirasikirwa zvakare naDavis mumutambo wekupedzisira 1120. Mushure mekurasikirwa kwake kwekupedzisira muna 1931, akatamba muchiitiko ichi kaviri, achirasikirwa mumasemifaira pazviitiko zviviri, kuna Clark McConachy, naWillie Smith zvichiteerana. 