[1] In 2019 McGuigan made his debut at a ranking event when he was given a wildcard aged fifteen years-old to the 2019 Northern Ireland Open.

[8] In May 2023, he won the Northern Ireland Amateur Championship title for a third consecutive year, defeating Raymond Fry 10–8 in the final.

[10] Awarded a wildcard to the 2023 Northern Ireland Open in October 2023,[11] he defeated Muhammad Asif to qualify for the main stages of the event in Belfast.

[15] In March 2024, he defeated Craig Steadman 5–4 in the final to win the EBSA European Snooker Championship and a tour card for the 2024/25 and 2025/26 seasons.

[16] He made a successful start to his pro career at the 2024 Championship League in Leicester in June 2024, beating Sanderson Lam 3-0 and qualifying from his round robin group.