Lydia Ko has spoken out against the ruling which denied Lexi Thompson a major title at the ANA Inspiration.
Ko finished in a tie for 11th at a controversial first women's major tournament of the year to retain her world number one ranking, but the tournament was overshadowed by a contentious ruling which saw Thompson penalised four shots to negate her runaway lead.
Thompson was leading the tournament by three shots with six holes to go when she was alerted by LPGA rules officials that she had been penalised for an infraction the day before.
An email from a television viewer tipped off the officials, who made the decision to penalise Thompson a day late, docking her two shots for the infraction and two shots for signing an incorrect scorecard.
"Is this a joke?" Thompson asked the rules official. After being assured it wasn't, she responded: "This is ridiculous."