British tennis player Fran Jones said her heart had "worked a little too hard" after she collapsed during a match in Colombia.
The 24-year-old was helped off court in a wheelchair but says checks have shown there will be no longer-term impact from the scare.
She attributed her collapse to not acclimatising to the high-altitude conditions in Bogota, having had a practice session cancelled because of rain.
"Aside from my low-level pre match warm up, my first exposure to the limited oxygen levels at a high intensity was my match," Jones posted in an Instagram story.