'Lucky' ace vaults Day into share of BMW clubhouse lead

Sep 15, 2017; Lake Forest, IL, USA; PGA golfer Jason Day tees off on the first hole during the second round of the BMW Championship golf tournament at Conway Farms Golf Club. Mandatory Credit: Brian Spurlock-USA TODAY Sports

(Reuters) - A "lucky" hole-in-one vaulted former world number one Jason Day into a share of the second-round clubhouse lead with American Rickie Fowler at the BMW Championship outside Chicago on Friday.

Day's tee shot at the 188-yard par-three 17th landed just in front of the green, took a couple of bounces and trickled into the hole, much to the Australian's surprise.