In a statement, the Ethics Commission ruled there was "no reason" to begin a formal investigation into Haggerty's use of Jon Tibbs Associates (JTA).

Ethics Commission chairperson Sandra Osborne claimed she was satisfied the American had not enlisted the services of JTA when the company was still working for the ITF.

JTA's relationship with the worldwide governing body had ended on May 31 after losing what the firm said was a "competitive communications tender issued by the ITF".

Osborne confirmed JTA had started working for Haggerty, who is seeking re-election at the ITF Annual General Assembly in Lisbon in September, on June 3.

She found that JTA Design, which is separate to JTA, had worked on Haggerty's manifesto, released on June 10, but that they were "separate corporate entities with separate staff and clients".

Osborne, President of the Barbados Olympic Association, added there was an "absence of evidence to suggest that, by engaging the services of JTA Design, Haggerty was able to receive favourable services from the ITF".

Irishman Dave Miley, one of three candidates challenging Haggerty in the election, had claimed his rival was in breach of the rules through his employment of JTA, a suggestion which the Ethics Commission has dismissed.

The ITF Ethics Commission also said there was no evidence to support a complaint made regarding Miley's attempt to hold a reception to speak to members attending the Confederation of African Tennis (CAT) Annual General Assembly in Madagascar last month.

The CAT blocked all candidates from attending for the sole purpose of promoting their campaign, although Haggerty was present in his role as ITF President.

Miley travelled to Madagascar and tried to "arrange a reception to speak with delegates and promote his campaign," the Ethics Commission said.

The rules for candidates state those in the race should "not participate in any official public forum or debate (such as a regional association meeting) for the sole or main purpose of promoting their candidacy unless equal opportunity to participate is offered to their opponents".

The reception did not take place owing to scheduling difficulties but Osborne decided it would not have been a breach even if it had been staged as it "was not officially part of the AGM and was organised to take place outside the official conference venue".

"In the absence of any evidence of a breach of the Rules for Candidates, the chair of the Ethics Commission has decided to close this matter," the ruling stated.

The conclusion of the cases mark the latest development in an increasingly fractious race for the ITF Presidency.

India's ITF vice-president Anil Khanna and the Czech Republic's Ivo Kaderka are also standing.