Leading first-round scores on Thursday in the US PGA Tour Arnold Palmer Invitational at Bay Hill in Orlando, Florida (USA unless noted, par-72): 66 - Rory McIlroy (NIR), Corey Conners (CAN) 67 - Bryson DeChambeau 68 - Jason Kokrak, An Byeong-hun (KOR), Sebastian Munoz (COL) 69 - Victor Perez (FRA), Martin Laird (SCO), Lanto Griffin, Lee Westwood (ENG), Matthew Fitzpatrick (ENG), Viktor Hovland (NOR), Im Sung-jae (KOR), Keegan Bradley 70 - Andrew Putnam, Jordan Spieth, Cameron Tringale, Tommy Fleetwood (ENG), Peter Malnati, Matt Wallace (ENG), Christiaan Bezuidenhout (RSA), Rory Sabbatini (SVK), Paul Casey (ENG), Ian Poulter (ENG), Adam Long, Max Homa, Jason Day (AUS), Padraig Harrington (IRL) afp