McIlroy shot an opening 4-under 66 that featured six birdies and long drives. "I certainly can tidy a few things up," he said, "but overall a decent day.”

The Masters champion opened with a 66 at the Philadelphia Cricket Club as Keith Mitchell set the pace with a course record 61.

Tee times for Friday's second round of the Truist Championship have been adjusted in anticipation of inclement weather.The PGA Tour announced Thursday that players would go in threesomes off split tees, from 8-10:01 a.m. EDT.Here's a look at the new tee times for Round 2 at Philadelphia Cricket Club: TimeTeePlayers8 AMEDT1Keith MitchellMichael KimMichael Thorbjornsen8 AMEDT10Min Woo LeeMaverick McNealyJordan Spieth8:11 AMEDT1Keegan BradleyShane LowryJustin Rose8:11 AMEDT10Justin ThomasRory McIlroyTommy Fleetwood8:22 AMEDT1Russell HenleyLudvig ÅbergSepp Straka8:22 AMEDT10Viktor HovlandWyndham ClarkCollin Morikawa8:33 AMEDT1Hideki MatsuyamaXander SchauffeleAkshay Bhatia8:33 AMEDT10Taylor PendrithTony FinauMax Homa8:44 AMEDT1Thomas DetryMatt FitzpatrickChristiaan Bezuidenhout8:44 AMEDT10Nick DunlapMatthieu PavonSi Woo Kim8:55 AMEDT1Garrick HiggoDaniel BergerJacob Bridgeman8:55 AMEDT10Brian CampbellPatrick RodgersRyan Gerard9:06 AMEDT1Joe HighsmithHarris EnglishRasmus Højgaard9:06 AMEDT10Ben GriffinLucas GloverSam Stevens9:17 AMEDT1Robert MacIntyreDavis ThompsonDenny McCarthy9:17 AMEDT10Brian HarmanPatrick CantlayTom Hoge9:28 AMEDT1Chris KirkCorey ConnersAdam Hadwin9:28 AMEDT10Sahith TheegalaCameron YoungMax Greyserman9:39 AMEDT1Sungjae ImAdam ScottAlex Noren9:39 AMEDT10Sam BurnsByeong Hun AnEric Cole9:50 AMEDT1Austin EckroatAaron RaiWill Zalatoris9:50 AMEDT10J.T. PostonCam DavisStephan Jaeger10:01 AMEDT1Nick TaylorErik van RooyenJ.J. Spaun10:01 AMEDT10Andrew NovakRickie FowlerGary Woodland