Britain's Kyle Edmund lost in the quarter-finals of the boys' singles at the French Open for the second consecutive year.
The 18-year-old from Beverley in East Yorkshire is very highly regarded and is already in the top 500 in the men's world rankings.
However, he found 16-year-old German Alexander Zverev too tough to handle on Thursday.
Edmund fought back well to win the second set after Zverev, the younger brother of tour player Mischa Zverev, had served for the match.
But the decider was rather one-sided as the German came through 6-2 5-7 6-0.
Edmund said: "It was quite frustrating. I started off quite flat and struggled to get any rhythm. But for me, as a positive, it was good that I was able to find a way to come back in the second set.
"I don't do that very often if I'm not playing as well as I liked. It's something me and my coach have been working on. But credit to him, he played really well in the third and I wasn't able to take some opportunities."