The No.16 seed Spaniard took the second set 6-3, closing it out with an ace to level things up at a set apiece.

Earlier, Kyrgios impressed with a blistering first set against Robredo, setting Arthur Ashe Stadium abuzz when he raced out to a 5-0 lead.

And he took the first two games of the second set in the same way he took his first-set lead - quickly. But Robredo was able to counter, with his serve looking too strong for the Aussie towards the back end of the second set.

After Kyrgios' blistering start to the first set Robredo fought back to 5-3, breaking Kyrgios' serve and turning the momentum against the Australian for a short period.

But Kyrgios broke Robredo's serve with a volley to win the first set 6-3.

The Australian has smashed eight aces to Robredo's two.

Kyrgios holds a 2-1 lead in the third set.

More to come