 Nyorai kuenderera mberi kwechikamu chino - Kumakwikwi eWorld Aquatics Championships a2017, Peaty akaramba ari mumakwikwi ake e100 metres breaststrokezita. Mushure mekukunda zviri nyore kupisa kwake uye nhangemutange dzema semi-fainari, akakunda mumakwikwi ekupedzisira achikunda nhangemutange ine rekodhi yemakwikwi yemasekondi 57.47. Peaty akatyorawo rekodhi yake yepasi pose kaviri mumakwikwi emamita 50 ekumhanya nechipfuva. Akanyora 26.10 masekondi mumakwikwi okutanga, uye mumasemi-fainari, akava munhu wokutanga kuputsa 26 masekondi uye akakunda mumasekondi 25.95. Akabudirira kudzivirira zita rake remamita 50 breaststroke neimwe sub-26 nguva yemasekondi 25.99 mumakwikwi ekupedzisira, achipedzisa imwe kaviri paWorld Championships navan der Burgh vachitora bronze. Akakunda imwe sirivheri mumamita 4 × 100 metres medley relay paWorld Championship, achiisa rekodhi nyowani yeBritish, aine mutsara mumwechete weOlympic weWalker-Hebborn, Guy naScott, asi akarasikirwa nemenduru mumamita 4 x 100 metres akasanganiswa medley relay naDavies, Guy naOConnor kunyangwe achiisa rekodhi nyowani yeEuropean. 