Manley made his debut in 1996 PDC World Matchplay Last 40 to Paul Cook, 5–2, in Last 32 to Dave Kelly 8-2 and Last 16 his losing to Jamie Harvey, 8–3.

Manley entered the Modus Online Super League, in December 2022 in preparation for the 2023 World Seniors Darts Championship in which he pulled off a 4 – 2 win over Alan Norris.

Manley's refusal to shake Taylor's hand after his 7-0 World Championship thrashing in 2002 led to darts fans booing him for many years.

Manley has gone on to say that whilst the booing and crowd reaction was hard for him and his family to take in the early days, it helped him as his career went on and ensured his popularity on the exhibition circuit.

Manley has also had notable spats with the likes of Roland Scholten, John Lowe, Rod Harrington, Dave Jowett and Wynand Havenga.