England win by 16 runs in Sydney to complete a one-day series win over Australia with two games to spare.
England hold their nerve to take a 2-0 lead in ODI series with a four-wicket victory over Australia at Brisbane on Friday.
Chasing a target of 305, Roy smashed 180 in 151 balls to take England home.
Australia have moved into third place while England have dropped to fifth position.
Australia romped home to an innings and 123 run win margin over England at the Sydney Cricket Ground to seal Ashes by 4-0.
The tourists closed day four on 4-93, trailing Australia by 210 runs on the fourth day of the fifth Ashes Test in Sydney on Sunday.
Australia close the the third day of the fifth and final Ashes Test on 4-479, a lead of 133 over England, after Usman Khawaja out for 171.
Australia finish second day on 2-193, 153 runs behind of the fifth Ashes Test at the SCG on Friday.
Joe Root and Jonny Bairstow are dismissed late on the first day as Australia fight back with the new ball at the SCG.
Australia recalling hard-hitting batsman Chris Lynn, alongside uncapped pacers Jhye Richardson and Andrew Tye, for the five-match series against England starting January 14 in Melbourne.