2020-2022: Turning Pro, Grand Slam debut and first win Ranked No. 303, Holt made his Grand Slam debut at the
2022 US Open as a qualifier after defeating
Dimitar Kuzmanov in the last round of qualifying. He won his first Grand Slam level match, upsetting 10th seed and world No. 12
Taylor Fritz. This was also Holt's first career win on the ATP Tour and his first top-15 win. He lost in the second round to
Pedro Cachín in five sets.
2023: Masters debut Holt qualified and made his major debut at the
2023 Australian Open, defeating
Marco Trungelliti in the last round of qualifying. He defeated fellow qualifier
Aleksandar Vukic in five sets, before losing in the second round to 24th seed
Roberto Bautista Agut in another match which went five sets. He qualified for the
2023 Dallas Open but lost to
J. J. Wolf in straight sets. Holt made his Masters 1000 main draw debut in
Indian Wells as a wildcard, losing in straight sets to
Thanasi Kokkinakis.
2024: First Challenger final Holt qualified for the
2024 Los Cabos Open but lost to fellow qualifier
Aleksandar Kovacevic in straight sets. Following this result and two Challenger finals, he returned to the top 250 on 16 June 2024. Ranked No. 227, he also qualified for the main draw of the
2024 Cincinnati Open, losing to
Arthur Fils in the first round.
2025: Maiden Challenger title, top 100 Between January and early March 2025 Holt appeared in three
ATP Challenger Tour finals, winning two, including the
2025 Bengaluru Open 125 Challenger. These results led to a new career high singles ranking of No. 111 on 3 March 2025. Following his first round win over
Benjamin Bonzi, after qualifying for the main draw at the
2025 Mallorca Championships, Holt reached the top 100 at world No. 99 on 30 June 2025. ==Personal life==