No — there is no reliable public source currently confirming Sydney Segal's left-handedness.

Sydney Segal gained public recognition as a contestant on the MTV reality television series 'The Challenge: Cutthroat' in 2010. During her time on the show, she was part of the 'Red Team' and competed against other reality TV stars in various physical and mental challenges.

Before her appearance on 'The Challenge,' Segal was known for her relationship with fellow reality star Abram Boise, which was a recurring theme during her time on the show. She was eliminated in the tenth episode.

Following her reality TV stint, Segal has largely maintained a private profile, with limited public information available about her life and career after 'The Challenge.'

Her participation in the competitive reality series showcased her personality and competitive spirit to a wide audience.