Great Britain's women are one win away from a clean sweep of their five-match series against the United States after a 5-2 victory in San Diego on Saturday.
Britain now lead 4-0 after the latest success with the final match on Sunday.
Great Britain coach Danny Kerry, who was frustrated at the two goals conceded, said: "It was another strong team performance.
"We had a good first half and created lots of chances and put the US defence under pressure."
All the goals came in the second half, with Laura Unsworth scoring her first international goal from a penalty corner and Helen Richardson rounding off a team move to make it 2-0 before Kathleen Sharkey cut the deficit.
Rebecca Herbert restored the two-goal margin and Hannah Macleod soon added a fourth, still within the first 15 minutes of the half. Herbert set up Katie Long to net Britain's fifth before Caroline Nichols grabbed a late consolation goal after Unsworth was yellow-carded.
On Thursday, two goals from Alex Danson and one each from Katie Long and Chloe Rogers saw Britain come from a goal down to win 4-1.
Danny Kerry's side had already enjoyed 3-2 and 3-1 victories over the USA this week, with another match rained off.