Tyrrell Hatton kept his return from wrist surgery right on course, firing a three-under par 69 to share the halfway lead in the Arnold Palmer Invitational with South Korea's Kang Sung.
England's Hatton, playing just his second tournament since right wrist surgery in November, notched his sixth straight round in the 60s and was tied with Kang on seven-under par 137.
Kang, who relished the chilly winds whipping across the Bay Hill course in Orlando, Florida, fired a four-under par 68.
The leading duo were one stroke in front of New Zealand's Danny Lee, whose four-under 67 was the round of the day.
World number one Rory McIlroy settled for a one-over 73 and headed a trio of players on 139 along with South Korean Im Sung-jae (69) and Harris English (70).
Hatton said his return tournament, the WGC Mexico Championship, was an ideal comeback event since it guaranteed him four rounds.
"That was interesting to see how my wrist kind of reacted to a full week's tournament golf, and it was absolutely fine," said Hatton, who tied for sixth at Chapultepec.
"No pain out on the golf course, which is important. And I've been able to practice how I want to practice before coming here, and my swing's generally been in an all right place."
"I hit it in some interesting spots," he said. "It's not easy with how strong the wind is."
- McIlroy still 'right there' -
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"I'm still right there in the golf tournament."