British junior Liam Broady suffered a second-round exit at the Australian Open boys' tournament after a 6-4 6-1 reverse against unseeded Robin Stanek.
Broady, 18, made the final of the 2011 Wimbledon junior event and was seeded third in the first Grand Slam of 2012.
But the Stockport teenager made 13 unforced errors as Czech Stanek's consistency wore him down.
Elsewhere Britain's fifth-ranked junior Joshua Ward-Hibbert overcame Italian eighth seed Stefano Napolitano 6-3 6-4.
Nottingham's Ward-Hibbert, who turns 18 on Wednesday, will face either Serbian ninth seed Nikola Milojevic or France's Quentin Halys in the third round.
Yorkshire's Kyle Edmund survived the rising temperatures and the loss of the first set to justify his status as seventh seed with a 4-6 6-1 6-1 win over Spain's Pol Toledo Baque, but Luke Bambridge was another Briton to exit, losing 6-4 7-6 to fourth seed Kaichi Uchida of Japan.
Broady and Ward-Hibbert came together to defeat Connor Farren and Frederico Ferreira Silva 6-2 6-2 in the doubles competition.