England have won their fourth consecutive one-day international of their five-match Royal London series against Australia as Jason Roy scored a remarkable century to secure the victory for Trevor Bayliss's side.
The brilliant partnership of Roy and Bairstow has seen the pair hit five centuries in just 16 games for England, averaging 68.62 for the first wicket.
Joe Root was able to last 10 overs and achieve 44 runs for Justin Langer's team, but the visitors fell short with a final score of 310-8.
Marsh and Finch were dismissed after reaching their centuries, which cost their side any hope of turning over England's total.
The game ended with the hosts winning by six wickets, and a fifth win at Old Trafford on Sunday will ensure their first ever ODI whitewash against Australia.