Preview:England captain Eoin Morgan hopes his side can maintain their "new level of intensity" after moving to within sight of a first 5-0 one-day worldwide series whitewash of Australia.
England have only ever whitewashed Zimbabwe in a five-match series before but reinforced their standing as the world's No 1 team by thrashing Australia for the second time in one-day cricket this year.
Rashid was then out for 20, leaving Australia needing just one wicket and England 11 runs to win.
Billy Stanlake (3-35) produced a devastating early burst and England looked beaten on 114-8, but Buttler (110 not out) and Adil Rashid combined for an 81-run stand to set up a tense finale.
Paine says that despite their setback in England, he expects to see most of the squad returning next year for their defence of the World Cup.
Fast bowler Billy Stanlake's opening spell of three wickets for 18 runs had given Australia a shot of a first global win under coach Justin Langer, appointed after Darren Lehmann resigned in the fall-out from the Cape Town ball-tampering scandal in March.
They were bowled out for 205 runs in just 34.4 overs.
Agar bowled Jason Roy - a centurion at Chester-le-Street on Thursday - when the opener missed a straight one attempted to hit him over the top and Jonny Bairstow chopped on before Stanlake snared Root - the Test skipper caught in the slips by Marsh.
England captain Eoin Morgan paid tribute to Buttler, saying: "We were very poor today and Jos really did pull something special out to get us over the line".
Jason Johnson succumbs to injuries at Beaver Dam
He is survived by wife Bobbi and son Jaxx. "Pastor Mark Kessler will hold Prayer at 6:30", the post read. NASCAR drivers woke up to news of Johnson's death hours before their race in California.
Mascherano denies rift between players and coach Sampaoli
"He is a unique player, who unfortunately hasn't won the three finals he has played with Argentina and that isn't easy". Sampaoli's predecessor, Edgardo Bauza, was also alarmed and told TyC Sports : "I saw an Argentina without identity".