 Nyorai kupfuurira kweiyi ndima - Van Rooijen akaenda kuUnited States muna January 2001 kunodzidza paYunivhesiti yeMiami. Akachengeta nzvimbo yake muchikwata chenyika panguva ye2001 World Aquatics ChampionshipsmuFukuoka, Japan iyo yakava kuodzwa mwoyo. Mumakwikwi ose ari maviri, 4 × 100 m uye 4 × 200 m freestyle, iye nechikwata chake vakadzingwa mumakwikwi. Akasvika kumagumo ake ekutanga ega muna 2002 muBerlin pa2002 European Aquatics Championships achipedza 8th mu200 m freestyle. Paivewo nemenduru yebronze kwaari mu4 × 100 m freestyle relay pamwe naMarleen Veldhuis, Chantal Groot naWilma van Hofwegen uye nzvimbo yechishanu mu4 × 200 m freestyle. Pa2003 World Aquatics Championships muBarcelona akangopotsa menduru yemakwikwi epasi rose nekupedza 4th mu4 × 100 m freestyle. Akawanawo nzvimbo yechinomwe mu4 × 200 freestyle. Pashure pemakore matatu akadzokera kumusha uye akawana nzvimbo muDordrecht, neTopzwemmen West-Nederland pasi pekutungamirirwa kwemudzidzisi-mudzidzisi Dick Bergsma asi akakundikana kukwanisa kuenda ku2004 Summer Olympics nekuda kwekukuvara kwakanyanya kwepafudzi. 