World number one Carlos Alcaraz says the stress of playing 22-time major champion Novak Djokovic led to the full body cramps which ruined his chances of winning their French Open semi-final.
Spain's Alcaraz, 20, started cramping early in the third set before Serbia's Djokovic, 36, won 6-3 5-7 6-1 6-1.
"It is not easy to play against Novak, he is a legend of our sport," he said.
"It has been really tough for me. I have never felt tension like I did in that match."
Top seed Alcaraz was only playing Djokovic for the second time and it was their first meeting at one of the four Grand Slams.