Morgan led England to their first 50-over World Cup title in 2019, but he is himself without a half-century in one-day internationals and Twenty20s for almost a year.
An unbeaten ton by Roy and an unbeaten knock of 86 runs by Buttler helped England chase the target of 245 runs in just 30.1 overs and at a loss of only two wickets, here at the VRA Cricket Ground, Amstelveen.