After a second round loss at the 2011 French Open, Barty won her only junior Grand Slam title at Wimbledon at the age of 15. She became just the second Australian to win the girls' singles event after Debbie Freeman in 1980, and the first Australian girl to win any junior Grand Slam singles title since Jelena Dokic at the 1998 US Open. Compatriot Luke Saville also won the boys' title to help Australia sweep both singles events. The only set she dropped in the tournament was to Madison Keys in the third round, and her victory in the final was against third seed Irina Khromacheva. In the last Grand Slam tournament of the year, Barty produced another strong singles result, losing to top seed Caroline Garcia in the semifinals of the US Open. Barty also won two more Grade 1 titles in doubles that season, one at Roehampton the week before Wimbledon and the other at the Canadian Open the week before the US Open. She concluded the season by winning the Junior Fed Cup for Australia with teammate Belinda Woolcock. Barty only played in one junior tournament the following year, where she finished runner-up in both singles and doubles at the Torneo International in Italy.