Michael Phelps is to return to competition following the end of his six-month ban for drink-driving. The 29-year-old American - the most decorated Olympian in history with 22 medals, 18 of them golds - will compete at the Arena Pro Swim Series event in Mesa, Arizona, from April 15-18. Phelps was suspended by USA swimming following his drink-driving arrest in September when police caught him travelling at 84mph in a 45mph zone in Baltimore, Maryland. Michael Phelps has won 22 Olympic medals, 18 golds, but was banned from swimming in September . Having served his six month suspension the American will return to the pool in Arizona next week . 'My suspension is finally up! Time to get back in the pool and race again! Looking forward to #mesa !!,' Phelps wrote on his official Twitter account. The Arizona meeting is the same one at which Phelps returned to last year after a 20-month retirement from competitive swimming. Phelps is still serving the 18 months of probation he received from a Baltimore District Court judge after he pleaded guilty to driving under the influence in December. The drink-driving arrest was Phelps' second in 10 years, and he responded by seeking treatment for alcohol abuse at an in-patient centre in Arizona. Phelps has been training in Baltimore and performed will in an exhibition race last month . Phelps has since returned to Baltimore where he has been training with long-time coach Bob Bowman and he swam impressively in a March exhibition race. As part of his punishment from USA Swimming, Phelps was also removed from the US team for the FINA World Championships to be held in Russia this summer. But USA Swimming executive director Chuck Wielgus said last month there was a chance Phelps could be restored to the team ahead of what would be his fourth Olympic Games at Rio in 2016.
Michael Phelps is the most successful ever Olympian with 18 gold medals .
Phelps was banned from swimming in September following arrest .
American swimmer will compete in Arizona next week in comeback .