Improved Ireland still no match for England as Root stars at Lord's
Ireland raised their game at Lord's after a sorry showing in Bristol, but England were still able to triumph by a wide margin.
Joe Root starred with bat and ball as England overcame a vastly improved Ireland to triumph by 85 runs at Lord's and complete a 2-0 one-day international series win.
Will Porterfield's side were thumped by seven wickets in Bristol after collapsing to 126 all out, but produced a much stronger performance in their landmark first ODI at the Home of Cricket.
Porterfield was Ireland's star performer, striking 82 from 83 balls, but England were still able to prevail with a degree of comfort, restricting their visitors to 243 all out in reply to 328-6.
Having taken two wickets in Friday's victory, Root returned 3-52 on this occasion, while the impressive Liam Plunkett picked up 3-23.
Root had earlier contributed a run-a-ball 73 in England's innings, one of three significant scores as skipper Eoin Morgan made 76 off 79 deliveries and Jonny Bairstow strengthened his claim for a regular ODI place with 72 not out from only 44 balls.
An assured third-wicket stand of 140 between Root and Morgan gave the hosts an excellent platform after the departure of openers Alex Hales (32) and Jason Roy (20), but both batsmen fell when well set and England were wobbling on 229-5 when Sam Billings followed for seven.
Bairstow, given an opportunity in this series with Ben Stokes and Jos Buttler playing in the IPL, provided welcome impetus, clubbing seven fours and three sixes as Yorkshire team-mate Adil Rashid (39 off 25 balls) offered fine support.
The last four overs of the innings went for 61 runs, leaving Ireland with a target of 329 - the same score they reached in a famous World Cup victory over England in 2011.
Paul Stirling's breezy 48 raised hopes of another upset, but Ireland lost wickets at regular intervals after the opener had edged Jake Ball behind.
Root's part-time off-spin accounted for three of the top six - Ed Joyce, Niall O'Brien and Gary Wilson - and Porterfield was left with too much to do as the required rate spiralled.
Ireland's skipper was eventually bowled walking across his stumps to Mark Wood, who also cleaned up George Dockrell to bring the match to a conclusion after Plunkett had claimed his second and third scalps.