Former world number one David Duval believes Rory McIlroy will complete the career grand slam, but fears that his latest bout of Masters misery will be tough to take.

Having arrived in plenty of time to tee off at the appointed time of 7am on Saturday, David Duval had not struck a ball until 6pm. 

Torrential rain on Friday and strong winds on Saturday may have forced the 144th Open Championship into an extra day, but the Old Course at St Andrews was vulnerable to low scoring on Sunday.