England’s Paul Waring shot a seven-under 63 to lead after the first round of the Texas Children’s Houston Open.
The 41-year-old, who is playing on a medical exemption and was a late entry to the field was five under at the turn and his bogey-free round was his lowest ever on the PGA Tour.
Waring, who has only made six cuts from 26 events on the PGA Tour, is one shot clear of former US Open champion Gary Woodland, while Sam Burns, Tom Hoge, and Michael Brennan are two shots behind at five under.
Englishman Marco Penge is a stroke further back at four under alongside his compatriot Matt Wallace.
World number Scottie Scheffler is not competing due to the imminent birth of his second child, while Northern Ireland’s Rory McIlroy is also missing as he prepares to defend his Masters crown in April.