World number one Carlos Alcaraz says he was "scared" after injuring his ankle during his first-round victory at the Japan Open in Tokyo on Thursday.
Top seed Alcaraz twisted his left ankle against Argentina's Sebastian Baez with the first set level at 2-2 and had to receive treatment from the physio and heavy strapping.
He returned to the court and broke Baez to lead 5-4, but his team seemed to signal for him to stop at this point, before play was then suspended for rain causing another delay.
When Alcaraz, who won the men's US Open title earlier this month, and Baez re-emerged under the roof, the Spaniard dominated the rest of the contest and won 6-4 6-2.