HSBC Champions tournament in China

Billy Horschel out, Cameron Smith in
 
SHANGHAI (AP) - Billy Horschel flew halfway around the world only to withdraw from the HSBC Champions with a sore back.
Horschel tweaked his back before leaving Florida for the final World Golf Championship of the year. 
The 2014 FedEx Cup champion gave it two days and tried to stretch it out on Tuesday before a practice round until deciding it was not worth risking hurting it more.
Horschel has been replaced in the 78-man field at Sheshan International by Cameron Smith of Australia.