Luke Donald believes Tiger Woods' comeback delay down to 'mental anguish'

The 40-year-old had planned to play in California this week and in the Turkish Airlines Open on the European Tour in November, but said on Monday he was not ready to compete.

Luke Donald believes "mental anguish" could be behind the decision of Tiger Woods to pull out of his planned comeback at this week's Safeway Open.

Former world number one Woods has undergone three back operations in the space of 19 months and has not played competitively since August last year.