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.”

Nothing can handle the longest of hitters, and Rory McIlroy understands that, which is why he will hit a lot of drivers this week in Philadelphia.

The PGA Tour's sixth signature event of the season begins Thursday at Philadelphia Cricket Club with the Truist Championship.Defending champion Rory McIlroy leads the field of 72 and will compete alongside Justin Thomas and Tommy Fleetwood at 12:26 p.m. EDT.Here's a look at the full-field tee times and groupings (click here for how to watch on Golf Channel):TimeTeePlayers11:09 AMEDT1Ben GriffinLucas GloverSam Stevens11:09 AMEDT10Joe HighsmithHarris EnglishRasmus Højgaard11:20 AMEDT1Brian HarmanPatrick CantlayTom Hoge11:20 AMEDT10Robert MacIntyreDavis ThompsonDenny McCarthy11:31 AMEDT1Sahith TheegalaCameron YoungMax Greyserman11:31 AMEDT10Chris KirkCorey ConnersAdam Hadwin11:42 AMEDT1Sam BurnsByeong Hun AnEric Cole11:42 AMEDT10Sungjae ImAdam ScottAlex Noren11:53 AMEDT1J.T. PostonCam DavisStephan Jaeger11:53 AMEDT10Austin EckroatAaron RaiWill Zalatoris12:04 PMEDT1Andrew NovakRickie FowlerGary Woodland12:04 PMEDT10Nick TaylorErik van RooyenJ.J. Spaun12:15 PMEDT1Min Woo LeeMaverick McNealyJordan Spieth12:15 PMEDT10Keith MitchellMichael KimMichael Thorbjornsen12:26 PMEDT1Justin ThomasRory McIlroyTommy Fleetwood12:26 PMEDT10Keegan BradleyShane LowryJustin Rose12:37 PMEDT1Viktor HovlandWyndham ClarkCollin Morikawa12:37 PMEDT10Russell HenleyLudvig ÅbergSepp Straka12:48 PMEDT1Taylor PendrithTony FinauMax Homa12:48 PMEDT10Hideki MatsuyamaXander SchauffeleAkshay Bhatia12:59 PMEDT1Nick DunlapMatthieu PavonSi Woo Kim12:59 PMEDT10Thomas DetryMatt FitzpatrickChristiaan Bezuidenhout1:10 PMEDT1Brian CampbellPatrick RodgersRyan Gerard1:10 PMEDT10Garrick HiggoDaniel BergerJacob Bridgeman