Stockport's Liam Broady knocked out first seed and world junior number one Jiri Vesely in the boys' third round.
The 15th seed secured his victory in straight sets, 6-4 7-5, to book a place in the quarter-finals.
Having claimed the first set, Broady went 2-0 up in the second after being 0-40 down in his opening service game.
His Czech opponent soon levelled the score but, after the 17-year-old saw out a tense 11th game, he broke Vesely again to wrap up an impressive win.
Having overcome a fellow left-hander in front of a packed crowd on court 19, Broady, who trains in Nottingham, will now face the unseeded German Robin Kern who beat world number six Filip Horansky, 6-3 6-1.
The Manchester-born junior followed up his impressive win by partnering Slovakian Horansky to a three-set victory over American Dennis Novikov and Japan's Kaichi Uchida, 4-6 6-4 6-1.
First seeds Vesely and Londoner Oliver Golding won their boys' doubles first-round match against Somerset's Andrew Bettles and Buckinghamshire junior Toby Martin, 7-5 6-3.
Wiltshire's Sam Hutt and Nottingham's Joshua Ward-Hibbert knocked out Russian pair Aslan Karatsev and Evgeny Karlovskiy, 4-6 7-5 6-3, and second seeds Mate Pavic of Croatia and Bolton's George Morgan beat Sean Berman of the United States and Australian Nick Kyrgios, 6-7 6-1 6-4.
Roehampton's Jonathan Cornish and Welsh junior Evan Hoyt suffered a three-sets defeat by Mexico's Marco Aurei Nunez and Belarussian Yaraslau Shyla, 7-6 4-6 6-4.
In the girls', Loughborough's Katie Boulter and Great Missenden's Laura Deigman lost to Brazil's Beatriz Haddad Maia and Russian Mayya Katsitadze in three sets, 4-6 6-3 6-2.
Norfolk's Pippa Horne and felllow Brit Sarah Beth Askew were beaten in straight sets, 7-5 6-4, by sixth seeds Jesika Maleckova of the Czech Republic and Slovakia's Chantal Skamlova.
Hertfordshire's Katy Dunn and Sheffield's Jessica Ren also went out in the first round, losing to Austria's Barbara Haas and Estonian Anett Kontaveit, the third seeds winning in two sets, 6-2 6-1.
Meanwhile Sutton's Ruth Seaborne went down in three sets to Japan's Risa Ozaki in a rain-delayed girls' singles second-round match, 6-2 3-6 6-4.
Seaborne and partner Daneika Borthwick, from Cumbria, were also knocked out in the girls' doubles, going down 6-1 6-4 to Victoria Duval of the United States and Madagascar's Zarah Razafimahatratra.