In the 2006 UK Open, he reached the quarter-finals, beating Jamie Harvey, Chris Mason, Mark Walsh and Terry Jenkins along the way.
As a result of a positive test for marijuana, he was: forced to return his £4,000 prize money from the UK Open; fined £2,000; and banned from competition for eight weeks.
He reached the 2009 Winmau World Masters final, beating 6th seed Ross Montgomery and qualifiers Connie Finnan from Ireland and Filipino Lourence Ilagan in the televised stages.
Green managed to secure qualification for the World Championship, but in the first round on the Lakeside Leisure Complex stage, he lost 3–2 to number 1 seed Tony O'Shea.
Green won the first set and had eight darts at double to win the second, but missed and eventually lost the match 5-3 having never retaken the lead.
Green then entered the World Championship as the 16th seed but, after high-quality wins over Darius Labanauskas and Peter Sajwani, was instilled as bookmakers' favourite for the title going into his quarter-final against Jeff Smith.
[6] Green had to wait until September to reach his first quarter-final back on the tour which came at the 16th Players Championship, but he lost 6–2 to Jelle Klaasen.
[8] Green qualified for the Grand Slam of Darts by winning five matches which included 5–1 successes over Andy Hamilton and Vincent van der Voort.
[15] He also took the final Pro Tour Order of Merit place for the World Grand Prix and won the first set against Dave Chisnall.
[16] Green made his PDC World Championship debut at the 2017 event, but only won two legs versus Raymond van Barneveld in a 3–0 loss.
[18] Green qualified for the Grand slam, where he beat James Wade 5–1, before losing to Phil Taylor 4-5 and 3–5 to Peter Machin.
The 2018 season was not good for the man from Wallasey due to a heavy knee injury, which had been affecting Green since he was 15 (after a football incident).
Robbie picked up far too little money and was unable to qualify for any of the Major and European tour events, thus leading to a dramatic fall in the rankings - he slid all the way to world number 77.