Britain's Johanna Konta felt humbled after she pulled off the biggest win of her career to knock out ninth seed Garbine Muguruza at the US Open.
Muguruza has made the French Open quarter-finals and the final at Wimbledon this year but was outfought and outmanoeuvred by Konta, who sealed a shock 7-6 (7/4) 6-7 (4/7) 6-2 victory.
Konta, ranked 97th in the world, will earn 120,200 US dollars - equivalent to ?78,800, the largest financial prize of her career - for reaching the third round at Flushing Meadows, where she will face Germany's Andrea Petkovic for a place in the last 16.
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The British number two now has 15 consecutive victories since losing to Maria Sharapova at Wimbledon but this was the first against an opponent in the top 80 and certainly her most impressive.
"I'm happy I get to be in the third round of the US Open, there is not that many people in the world that can say they have done that," Konta said.
"I'm very humbled about this experience and just really enjoying every second of it."
The match had clocked three hours and 23 minutes by the finish, which set a new US Open record for a women's match since the tie-break was introduced in 1970.
On a sweltering hot day when America's Jack Sock was forced to withdraw due to heat exhaustion, Konta admits she was pushed to her physical limits.
"I did have a thought out there, 'would it be really embarrassing if I just toppled over here?'" Konta said.
"Obviously it's difficult when you're sweating buckets. When I changed the clothes, they weighed a lot."
Muguruza arrived in Flushing Meadows on the back of first-round defeats in both Toronto and Cincinnati and she looked out of sorts throughout, throwing in 13 double faults and 59 unforced errors.
That should not detract from the display of Konta, however, who appears a player transformed under Spanish coach Esteban Carrill and now has a realistic chance of progressing to the fourth round.
"Muguruza didn't come out playing her best tennis," Konta said.
"But she always comes out being as competitive as possible, and that's why she is top-10 in the world and a Wimbledon finalist.
"I'm just happy that I was able to come through."
Konta is the only British player to have joined Andy Murray in round three after Aljaz Bedene lost in four sets to American Donald Young.
Slovenia-born Bedene, who switched allegiance to Britain in March, is yet to go past the second round of a major tournament and the world number 57's wait continues after Young progressed 3-6 6-4 6-4 6-2.