Britain's Johanna Konta has refused to look further than her next match against Andrea Petkovic at the US Open.
The 24-year-old progressed into the third round of the Grand Slam for the first time in her career with a three-set win over ninth seed Garbine Muguruza on Thursday.
The three-and-a-half-hour match was the longest since 1970 in the women's tournament at Flushing Meadows, and Konta is refusing to consider how far she can go.
"Right now I'm just in the third round and I'm playing against another incredibly tough player, Petkovic," Konta told reporters. "I'm focusing on that match, and we will see how that goes."
Konta switched allegiance from Australia to Great Britain in 2012.
