Tuhia he haere tonu mo tenei waahanga - I mutu a Willis i te 4th i te 2013 World Championships me te 2013 European Championships (SC) (i roto i te 200 mita breaststroke). I mutu ia i te tuawha i te 2014 European Championships
I riro hoki i a ia te mētara parahi i te 2014 Commonwealth Games i te whiringa toa 200 mita i Glasgow. I mutu ia i te 4th i te 2015 World Championships me te wikitoria i te mētara parahi i te 2015 European Championships (SC) i roto i te 200 mita breaststroke. I uru ia ki te 2016 European Championships, a ka mutu i te 4th i te whakamutunga o te 200 mita breaststroke i te 2016 Summer Olympics i Rio. I haere ia ki te wikitoria i te mētara hiriwa i te 2016 World Championships (SC). I eke a Willis ki te whiringa toa mo te 100 mita me te 200 mita i nga Taakaro o te Commonwealth 2018, i te wa i mutu ai ia i te 8 me te 4 o nga wa. I te Hōngongoi 2018, i reti a Willis mai i te kaukau whakataetae.