CARLOS ALCARAZ laboured to a second-round victory today over Dutch qualifier Jesper de Jong in a match that raised more questions about his chances of lasting the course at the French Open.

The Spanish third seed and reigning Wimbledon champion, who has been battling a forearm injury for two months, needed four sets to see off the world number 176.

The warning signs were there when Alcaraz, once again wearing a support sleeve on his right arm, was broken in his first service game.