 Ramba uchinyora ndima iyi - Pamakwikwi eOlympic eZhizha ra2000 muSydney, Muller akakwikwidza mumitambo mina yokushambira. Akawana FINA A-mazinga e25.94 50 m freestyle, 55.82 100 m freestyle, uye 2:00.35 200 m freestyle kubva kuSouth African Nationals muJohannesburg. Muchiitiko chake chokutanga, 200 m freestyle, Muller akapedza hafu yake yekupedzisira nekumhanya kwepfumbamwe-yakasimwa nguva ye2: 00.04. Pakutanga mumakwikwi ekutanga, akaisa nguva yechipiri yekukurumidza uye rekodhi yeSouth Africa ye1:59.89. Mazuva matatu gare gare, mumakwikwi emamita 100 akasununguka, Muller akapedza ari wechitanhatu mumakwikwi ekupedzisira aine rekodhi yeAfrica yemakumi mashanu nemashanu nemakumi mapfumbamwe nemapfumbamwe. Mumakwikwi emamita 50 akasununguka, Muller akaisa nguva ye26.07 kubva pakupisa kwepfumbamwe, asi akarasikirwa nemasemifaira ne11-zana remasekondi. Pazuva rokupedzisira purogiramu yacho, Muller akabatanazve naLoots, Sarah Poewe, naCharlene Wittstock munhangemutange ye4×100 m medley relay. Achishambira mutsoka yakasununguka, Muller akasimbisa nhangemutange nechikamu che54.77, chinyorwa chitsva chenyika, asi vanhu veSouth Africa vakagutsikana chete nenzvimbo yechishanu munguva yekupedzisira ye4:05.15. 