[2] In January 2012, Brown entered the Professional Darts Corporation's Q-School event in an attempt to earn a two-year tour card.

[4] However, he also posted some impressive results out of the handful of main tour events he did play, most notably in the fifth and sixth Players Championships.

[5] In the former he lost to Justin Pipe 2–6 in the last 16, and in the latter he defeated the likes of James Wade, Andy Hamilton and Terry Jenkins, before losing in the semi-finals 1–6 to Dave Chisnall.

[16] In the quarter-finals of the seventh Players Championship event, Brown averaged an incredible 112.32 to beat Ben Ward 6–1, sealing his win with a 10-darter.

[17] In May, Brown won the World Youth Championship 6–4 against Rowby-John Rodriguez at the O2 Arena in London as part of the Premier League finals night.

[1] At the Grand Slam he lost 1–5 to Dave Chisnall in his opening group game, but then averaged 100.60 in eliminating two-time world champion Adrian Lewis 5–1, and defeated Rodriguez 5–3 to reach the last 16.

[19] He faced five-time world champion Raymond van Barneveld and raced into a 9–3 lead to stand just one leg away from the quarter-finals in his first televised event.

[27] Brown reached the final of the eighth Players Championship and took out a pair of 130 finishes as he averaged 111.72 in defeating Lewis 6–3 to claim his first professional title.

[30] Brown also qualified for the World Grand Prix for the first time and lost 1–2 in sets to Michael van Gerwen in the opening round.

[36] He qualified for the Players Championship Finals and lost 5–6 to Ian White in the first round, missing three match darts in the process.

[38] Brown made it through to the last 16 of the 2018 PDC World Darts Championship, defeating James Wade on route, where he faced Phil Taylor.

This game was one step too far for Brown as he lost 7–3, but his run to the semi-finals caused him to make the top 32 in the PDC Order of Merit for the first time.

On 12 December, he earned his first victory in an Essex County shirt, beating Aaron Turner of Hampshire with a 4–0 win, recording a 29.91 average.

He defeated Simon Whitlock in the first round before a surprise victory over defending champion Gerwyn Price, where Brown produced a 164 checkout to win the match 6–4.