Rory McIlroy carded an opening round of 70 to end the opening day of the Kolon Korea Open tied for 12th place in his first tournament back after a month-long break from the game.
The world number six is the star attraction in the OneAsia Tour event but finished his first round three shots behind early leader Jang Ik-jae on one under par after a bogey at the third and double bogey at the 13th created two blots on his round.
The Northern Irishman birdied the fifth and 14th holes before he picked up back-to-back shots on the 17th and last to finish day one at one under par in a six-way tie for 12th.
Jang claimed birdies on the fifth and 12th with an eagle on the 10th seeing him complete the round in 67, four under par, to finish one stroke ahead of Kang Sung-hoon, Yoon Jung-ho, Hoon Min-kyu and Eric Mina who were tied for second.
McIlroy has not played since failing to qualify for the 30-man field in the PGA Tour's final play-off event in September.
The Korea Open marks the start of a month-long tour of Asia for the former world number one that is guaranteed to earn him more than £3million in appearance fees after a disappointing year.