Tyler Duncan has withdrawn from the Texas Children's Houston Open with a back injury. He will be replaced by Cody Gribble. The first round of the tournament is scheduled for today, and some golfers have even teed off already, so it is a bit of a last minute removal.Duncan was a long shot to win the tournament. He was +20000 to come away with the trophy, and Gribble likely won't have much better odds. There are some quality golfers in the field, and it will be difficult for Gribble, as it would have been for Duncan.Who has the best odds to win the Texas Children's Houston Open?The PGA Tour has a pretty strong field at the Texas Children's Houston Open this year. Tony Finau is the defending champion, so he has a very strong chance to win. However, there are loads of very good players in this field.Scottie Scheffler is the favorite to win and it should come as no surprise,. He's in such rare form that he will likely be the favorite for every single tournament he plays for a while, including majors.Wyndham Clark is also in good form, and he's expected to make a run for the title. Will Zalatoris, Sahith Theegala, Finau and others have strong odds, too. Here are the odds for most of the field per CBS Sports:Scottie Scheffler +260Wyndham Clark +1200Will Zalatoris +2000Sahith Theegala +2000Tony Finau +2200Jason Day +2500Si Woo Kim +3000Alex Noren +3500Tom Hoge +4500Stephan Jaeger +4500Keith Mitchell +4500Kurt Kitayama +5000Beau Hossler +5000Aaron Rai +5000Jake Knapp +5500Billy Horschel +5500Mackenzie Hughes +6000Doug Ghim +6000Akshay Bhatia +6000Taylor Moore +7000Patrick Rodgers +7000Luke List +7000Thorbjorn Olesen +7000Taylor Montgomery +7500K.H. Lee +8000Joel Dahmen +8000Thomas Detry +9000Ryan Fox +9000Davis Thompson +9000Cam Davis +9000Ben Griffin +9000Sam Ryder +11000Robert MacIntyre +11000Mark Hubbard +11000Cameron Champ +11000Andrew Novak +11000Adam Svensson +11000Victor Perez +13000Scott Stallings +13000Ryan Moore +13000Peter Malnati +13000Matt Wallace +13000Joseph Bramlett +13000Greyson Sigg +13000Daniel Berger +13000Chandler Phillips +13000Carl Yuan +13000Ben Silverman +13000The PGA Tour's reigning winner, Peter Malnati, is a bit of a longshot to win again this weekend. He won the Valspar Championship by two strokes, and he could use that momentum to do well this weekend, but oddsmakers aren't convinced he'll win again.Can Peter Malnati also win the Houston Open?Tyler Duncan won't play this week, which means he can't defy the odds and get a victory. He is 34 years old and has been a pro for 12 seasons, but he is searching for his second-ever win. He hasn't won since the RSM Classic in 2020. That search will continue.