Number two lost 6-3 64 to the Environment number 372 Janko Tipsarevic.

Norrie, the world number 55, 23, was summoned third in Houston.

He lost his function in the first match and has been broken three times in the first group because the n, a former top-10 participant, who shot it in 31 minutes.

Norrie got an early break in the second, but lost function in the group as the win was sealed by Tipsarevic.