KAPALUA, Hawaii -- A back injury in the Bahamas made things more puzzling for Xander Schauffele, who withdrew from Friday's Sentry Tournament of Champions and will undergo an MRI to see what's wrong.The sixth-ranked Schauffele, who won three PGA Tour titles last year, stopped on the par-5 ninth hole because he felt he couldn't swing at full speed.Schauffele had no issues … [Read more...] about Xander Schauffele withdraws from Tournament of Champions