These two have never played before.
Stosur has not done as well on hard courts as we might have expected. Her big serve should give her an advantage over many players but she under performs so often. Her best surface in 2016 has actually been clay!. On hard courts she had a quarter final in Sydney and a third round in Indian Wells. That’s not really good enough for someone with her ability.
Kudryavtseva has come through the qualifying rounds. She needed 3 sets to beat 353 ranked Danielle Lao from America. Her best weeks have also been on clay this year.
Stosur reached the semi final last year which was her first visit to Washington. She starts around 1.24 but there is always a chance that she starts by being broken early.
Back Stosur if she is a break behind.