Due to rib discomfort, Grace withdrew from the LIV Golf Thailand competition in the middle of his third round.
Branden Grace had to withdraw from the event on Saturday owing to a problem with his rib cage, making him the first LIV Golf participant to do so.
Grace, a South African who shot a 62 in the third round of the 2017 British Open at Royal Birkdale, holds the record for the lowest score ever shot in a major championship.
In the second round of the LIV Golf Invitational Series Bangkok event, Grace started feeling pain on the second hole at Stonehill.
He struck his tee shot at the third hole, finished the hole, but was unable to proceed. He then underwent treatment from a physical therapist.
With Richard Bland and Eugenio Chacarra, Grace, 34, shared the event's first-round lead after shooting a 65. He drew after being one stroke behind Chacarra.