Gerald Imray reports and while I'm not sure what a challenge entails, it's not surprising that a 15-year user who has made a lot of money putting this way would challenge the ban.
"It has been out for that long," Langer said Thursday at the Nedbank Challenge. "If there is anything illegal about it, why did they not stop it right away? If it is that easy with a long putter, a belly putter, why aren't 90 percent of the pros and 100 percent of the amateurs using it?"
Langer suggested there might be a challenge to the rule proposal.