Patrick Cantlay will no longer headline the field at the John Deere Classic. The eight-time winner is withdrawing three days ahead of his initial tee time. The reason for his withdrawal was not disclosed by the PGA Tour. He has been in good form lately, finishing in the top five of the last two events he has played. He will be replaced by two-time winner Russell Knox.The PGA Tour Communications X page revealed:"Patrick Cantlay is a WD from the John Deere Classic and is replaced in the field by Russell Knox."Cantlay was the betting favorite prior to withdrawal. He had slightly better odds than Jordan Spieth, Sungjae Im, Sepp Straka, and others. Now, Spieth will presumably have the more favorable odds this weekend.Cantlay was also one of the highest-ranked members of the field. He is World No. 8 right now, and the next-closest player in the field for the John Deere Classic is Sepp Straka at 24th overall. Spieth is ranked 32nd as well.Full odds for John Deere Classic without Patrick CantlayPatrick Cantlay was expected by oddsmakers to win the John Deere Classic. The star golfer put in a top-five finish at the Travelers Championship and was tied for third at the US Open before that.Patrick Cantlay is no longer the favoriteThe odds provided here did include Patrick Cantlay (+900). These will shift before tee times on Thursday since Cantlay has been removed from the field. As it stands, Jordan Spieth had the second-best odds and is now the favorite.Here are the odds via CBS Sports:Jordan Spieth +1800Sungjae Im +2000Sepp Straka +2000Aaron Rai +2200Maverick McNealy +2800Keith Mitchell +2800Davis Thompson +3000Denny McCarthy +3000Jason Day +3300J.T. Poston +3500Sam Stevens +4000Nick Dunlap +4000Cam Davis +5000Kevin Yu +5000Eric Cole +6000Beau Hossler +6000Taylor Montgomery +6000Luke Clanton +6500Ben Griffin +6500Mark Hubbard +6500Lucas Glover +6500Patrick Rodgers +7000Ryo Hisatsune +7000Michael Thorbjornsen +7000Thorbjørn Olesen +7000Adam Svensson +7500Doug Ghim +7500Andrew Novak +8000Adam Schenk +8000Daniel Berger +8000Seamus Power +8000J.J. Spaun +8000Lee Hodges +8000Michael Kim +9000Jhonattan Vegas +9000S.H. Kim +10000Nate Lashley +10000Neal Shipley +10000Davis Riley +10000K.H. Lee +10000Alejandro Tosti +10000Mac Meissner +11000Dylan Wu +11000Alex Smalley +11000Jake Knapp +11000Joseph Bramlett +11000Andrew Putnam +11000Hayden Springer +11000Brendon Todd +11000Rico Hoey +11000Chris Gotterup +11000Chan Kim +11000Jacob Bridgeman +11000Luke List +11000David Skinns +12000Justin Lower +12000C.T. Pan +12000Pierceson Coody +12000Chandler Phillips +12000Zach Johnson +12000Cameron Champ +12000Joel Dahmen +15000Nick Hardy +15000Sami Valimaki +15000Ryan Moore +15000Greyson Sigg +15000Chesson Hadley +15000Garrick Higgo +15000Carson Young +15000Ben Silverman +15000Vince Whaley +15000Either way, Cantlay's withdrawal shakes things up for the PGA Tour this weekend.