The trio of assists took Donovan's tally to 135, joining New England Revolution great Ralston, and he is now planning to pass the record in what is his final season of competitive football.
"I'm proud of it," said Donovan who also scored in the rout.
"To get an assist record, you have to have a lot of people scoring goals, so it's not just putting the ball in the right place, it's people finishing, and they scored three very good goals tonight, which helped.
"I've had a lot of guys score a lot of goals on my behalf, so it's a credit to all of them, too."
Of the assists record, Donovan added: "I want to get it. I do want to get it. But I'm not going to pass up an easy shot to get it.
"If I get in that position, I'm going to shoot and try to score. If it's in the right circumstances and I see the right pass, I'm going to make it.
"I'm not going to kill myself trying to get an assist every time, I'm just going to keep playing the game, and I think it will come."
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