Warwickshire captain Will Rhodes scored his maiden double century before Worcestershire openers Daryl Mitchell and Jake Libby launched a powerful response on day two of the Bob Willis Trophy encounter at Blackfinch New Road.
Rhodes extended his overnight 142 not out – already a career best – to 207 before he became one of five victims of Worcestershire paceman Charlie Morris.
The 25-year-old helped Warwickshire secure three batting points as they reached 355-9 declared shortly after lunch.