Rory McIlroy says he remains committed to improving having finished the first day of his new season on the top of the leaderboard.
The world No 2 shot a five-under-par 66 to hold a 1-shot lead at the end of the opening day of the Dubai Invitational.
It was his first return to competitive action since he signed off the finest year of his career by winning the Race to Dubai in November.
Despite completing the career slam by winning The Masters
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