Emma Raducanu retired from her first-round match against Camila Osorio at the Qatar Open, two days after losing the Transylvania Open final.
The British number one called the trainer out at the start of the third set to have her blood pressure taken, and after going 2-0 down in the decider to Colombia's Osorio she forfeited the match.
Raducanu had won the first set 6-2 before conceding the second 6-4.
On Saturday the 23-year-old featured in her first final since her 2021 US Open triumph, but was beaten in little more than an hour by Sorana Cirstea at the Transylvania Open.