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As a child Peniston survived rhabdomyosarcoma, a soft tissuecancer, and had to have surgery to remove a tumor and chemotherapy at St Bartholomew’s Hospital in London. Annual check-ups revealed that the cancer slowed his growth process, and he was much smaller than his classmates until he was 16 years old. Aged
13 years old he moved to Nice, France to train at ISP Academy before going to College at 18.[2] A graduate of the University of Memphis tennis programme[3] he was part of the GB University Team, managed by the LTA, that won the nation’s first ever team gold medal at Master’U Championships.[4][5]
During the COVID-19 pandemic in 2020 Peniston took part in the ‘Battle of the Brits’ tournament and performed well losing only on final set tie-breaks against top 50 players Dan Evans and Cameron Norrie.[6]
He was given a wildcard into the singles and doubles main draws of the 2021 Nottingham Open.[9] He then received a wildcard for the 2021 Queen's Club Championships doubles main draw, playing alongside Liam Broady, and the qualifying draw in the singles.[10][11] In the doubles first round, Peniston and Broady defeated Alexander Bublik and Nicholas Monroe in straight sets. In the singles qualifying, Peniston defeated Marc-Andrea Huesler before losing to Aleksandar Vukic in 3 sets.