[2] While Coll never achieved the same success in his junior career that he would see at the professional level, his first major breakthrough came when he was ranked 31st in the world and won the $100,000 St. George's Hill Classic in Weybridge, England, as a qualifier.

[3][4] On the other side, fellow New Zealand squash player, Joelle King clinched a historical gold medal in the women's singles event.

Coll enjoyed more success in March when he won his first Windy City Open title in Chicago after coming back from two games down against Youssef Ibrahim of Egypt.

The next month in April, he successfully defended his 2021 British Open title without dropping a single set the entire tournament.

[10] In the 2023 New Year Honours, Coll was appointed an Officer of the New Zealand Order of Merit, for services to squash.

[11] In May 2023, he reached the quarter final of the 2023 PSA Men's World Squash Championship, before losing to rival Ali Farag.