South Africa capped off an impressive display against the Netherlands in the first ODI at Willowmoore Park on Friday.
South Africa announce squad for all-important Super League series against Netherlands.
South Africa chase record 259 as Johnson Charles and Quinton de Kock hit hundreds.
South Africa were in trouble at 87 for 4 before Klaasen partnered with Miller and Jansen to make light work of the target.
West Indies has a 1-0 lead in the series. The first ODI was abandoned without a ball bowled.
South Africa won the second Test against West Indies in Johannesburg by 284 runs.