In October 2018, he signed his first professional contract with Kent County Cricket Club, having joined the county club at the age of 10, playing for them at age group level and being a member of the club's academy program, where he won the John Aitken Gray Award for best Academy scholarship holder in 2018.

Cox has played for the England under-19 cricket team, including at the 2020 Under-19 World Cup. Along with Jack Leaning, he set a new highest partnership for any wicket for Kent in 2020, scoring in an unbroken partnership of 423 runs against Sussex in Canterbury 238 points.

Early Life

Cox was born in Margate in Kent and was educated at Wellesley House School and Felsted School. He first played for Kent's second eleven in 2017. He played for the London and East team in the ECB Super-4s Developmental T20 competition in 2018 and was named player of the tournament. In early 2019, he played for the England under-19 cricket team on their tour of Bangladesh. In club cricket he plays for Sandwich Town Cricket Club in the Kent Cricket League.

Cricket Career

After scoring in a 50-over Second XI Test match in April 2019, he made his List A cricket debut on 27 April 2019 against the touring Pakistanis, scoring 21 runs. After a series of good batting performances, including two goals for the second eleven in the 2019 season, Cox made his first-class cricket debut against Hampshire in July and was named in the England under-19 squad for a series of games against India and Bangladesh in August . He made his Twenty20 debut later that month against Somerset in the 2019 t20 Blast.

After ending a three-game series of matches against West Indies and Sri Lanka under-19s in December 2019 as England's top under-19 run-scorer, Cox was named in England's squad for the 2020 Under-19 Cricket World Cup in South Africa the following month.

In August 2020, Cox scored his first century in first-class cricket in the second round of the 2020 Bob Willis Trophy at Canterbury against Sussex. Cox finished the innings unbeaten on 238 in a Kent record partnership with Jack Leaning for each wicket of 423 runs, a player born in the 2000s.

Cox was subsequently stood down for Kent's next game after posing for photographs with the club's young fans, a breach of the club's medical protocols put in place during the COVID-19 pandemic. Later in the year, Cox signed a contract extension with Kent, extending his contract until the end of the 2023 season.

During the 2021 season, Cox was named player of the match as Kent won the 2021 T20 Blast final. He scored 58 not out from 28 balls in the final and his "incredible piece of field gymnastics" helped take the wicket of Somerset batsman Lewis Gregory, with Cox passing the ball back from beyond the boundary to teammate Matt Milnes, who was able to take the catch.  He was part of the Oval Invincible squad for the 2021 season of The Hundred and was selected in the wildcard draft ahead of the competition. Although he did not play a game for the team during the season, he was retained for the 2022 season.

Cox holds an Australian passport and played Sydney Grade cricket for Mosman Cricket Club in the 2021/22 English off-season after playing for Eastern Suburbs in the previous season. In December 2021, he was recruited by Big Bash League team Hobart Hurricanes as a substitute for the opening game of the 2021–22 season. In September 2022, Cox was one of five uncapped players named in the England squad for their seven-match Twenty20 International tour of Pakistan later that month.