By Piers Newbery
BBC Sport at Wimbledon
Miles Kasiri failed in his bid to become Britain's first Wimbledon boy's singles champion for 42 years as he lost to France's Gael Monfils.
Monfils justified his position as the world's leading junior
The 18-year-old from Margate went down 7-5 7-6 (8-6) to the top seed.
On a packed Court Three, Kasiri had early break points before dropping a tight opening set.
He recovered from a break down in the second but could not hang on in the tie-break, the French player sealing victory on his second match point.
Monfils adds the Wimbledon title to this year's Australian and French Opens.
"I'm disappointed because I know how close I was," said Kasiri. "It was so close.
"Just a couple of points, that would have made the whole difference. I could have won instead of him if I would have won only two extra points.
"It gives me a lot of confidence that maybe I'm on the right track but I've got a lot of improvements to make."