Colin Montgomerie is suing his estranged wife for £5 million in a divorce dispute over his former wife's home.
The eight-time European Tour Order of Merit winner gave three hours of evidence at a hearing at the Court of Session in Edinburgh.
Montgomerie, 53, split from Gaynor, 50, in 2015 following alligations about his private life.
During the hearing, judge Lord Doherty heard claims about alleged unfairness of a "postnuptial agreement" which was signed between the couple in 2010.
The deal allegedly committed the sportsman to paying for the upkeep of Gaynor's £2million farmhouse in the event of a split.
Montgomerie, who currently lives in Ayrshire, believes the deal isn't fair and reasonable.
The court heard he thought it only came into effect if he cheated on his wife again.
Montgomerie is now demanding £5 million and payments of £6,500 a month from his former wife, while she is suing him for £5 million and £10,000 a month.
Montgomerie issued a statement yesterday which said: “I will not be commenting on my private life other than to confirm I raised proceedings some time ago seeking divorce from Gaynor.
“This matter is now being dealt with by the court.”
The hearing continues.