Adjei-Darko, who grew up in Accra, was a right-handed serve and volley player.

As a junior he competed in grand slam events, including the 2001 US Open, where he made the quarter-finals of the doubles.

[1] Between 2001 and 2012, Adjei-Darko featured in a total of 25 Davis Cup ties for Ghana.

Adjei-Darko played mostly in ITF Futures tournaments and reached a career high singles ranking of 275 in the world.

While on the tour he also featured in the occasional Challenger event and was a semi-finalist at Orlando in 2005.