Ward, 24, beat Dutchman Igor Sijsling 7-6 [7-5] 6-2 to earn a place in a Grand Slam event for the first time outside of Wimbledon.
"It's a pleasing day for me. I had a couple of tough matches, a couple of long three-setters, so to play well today was great," said Ward.
"Every time you go out there you believe you are going to win but it doesn't happen every week, there are a lot of good players out there.
"Obviously watching Andy [Murray] and what he does and the success he is having it makes you realise what level you have to get to."
Seventeen-year-old Robson took 75 minutes to defeat Ukraine's Olga Savchuk, winning 6-1 7-6 [7-2].
"It's the second time I have [come through qualifying], which is very good," said the world number 133.
"And in the last two Grand Slams I have played, I have won the first round in the main draw and I hope I can do that again here."