Keegan Brown began playing darts at the age of nine and was playing in men's county league games for the Isle of Wight at the age of 13. He qualified for the 2011 PDC Under-21 World Championship but lost to Michael van Gerwen 2–4 in the last 64.
In January 2012, Brown entered the Professional Darts Corporation's Q-School event in an attempt to earn a two-year tour card. He achieved this by finishing seventh on the Order of Merit after the four days of play, comfortably inside the top 24 who won their places. In May 2014, 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. The title secured Brown's place in the 2014 Grand Slam of Darts and 2015 World Championship. Brown made his debut in the 2015 World Matchplay and he started very well to be 5–1 ahead of Robert Thornton and went on to win 10–7. He relinquished an 8–5 advantage over Dave Chisnall in the second round as he was beaten 11–13. Keegan qualified for the German darts open in 2019, then world number 36, produced the performance of a lifetime to defy a 108 average from van Gerwen, and defeat him 6–4 with 100% on doubles. Keegan defeated James Wilson 6–0 in the last 16 with a 98 average, before defeating Gerwyn Price 6–5 in a thriller to qualify for his first Euro Tour semi-final.

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