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The Day Train rolls through Chicago: Jason Day blasts way into lead at BMW

  • Jason Day, of Australia, acknowledges the gallery after making birdie on the 10th hole during the first round of the BMW Championship golf tournament at Conway Farms Golf Club, Thursday, Sept. 17, 2015, in Lake Forest, Ill. (AP Photo/Charles Rex Arbogast)

    Jason Day, of Australia, acknowledges the gallery after making birdie on the 10th hole during the first round of the BMW Championship golf tournament at Conway Farms Golf Club, Thursday, Sept. 17, 2015, in Lake Forest, Ill. (AP Photo/Charles Rex Arbogast)  (The Associated Press)

  • Jason Day, of Australia, is silhouetted as he walks to the 12th tee during the first round of the BMW Championship golf tournament at Conway Farms Golf Club, Thursday, Sept. 17, 2015, in Lake Forest, Ill. (AP Photo/Charles Rex Arbogast)

    Jason Day, of Australia, is silhouetted as he walks to the 12th tee during the first round of the BMW Championship golf tournament at Conway Farms Golf Club, Thursday, Sept. 17, 2015, in Lake Forest, Ill. (AP Photo/Charles Rex Arbogast)  (The Associated Press)

  • Jason Day, left, of Australia,  talks with Jordan Spieth on the 10th green, during the first round of the BMW Championship golf tournament at Conway Farms Golf Club, Thursday, Sept. 17, 2015, in Lake Forest, Ill. (AP Photo/Charles Rex Arbogast)

    Jason Day, left, of Australia, talks with Jordan Spieth on the 10th green, during the first round of the BMW Championship golf tournament at Conway Farms Golf Club, Thursday, Sept. 17, 2015, in Lake Forest, Ill. (AP Photo/Charles Rex Arbogast)  (The Associated Press)

Only the weather could stop Jason Day at the BMW Championship on Thursday.

Day began his latest quest to reach No. 1 by holing out from a fairway bunker for eagle and powering his way to 10-under par through 17 holes. He hit a 346-yard drive with the wind at his back, and had 44 yards to the ninth green when play was stopped because of approaching storms. Day needed an eagle on his last hole for a 59.

He was four shots ahead of Daniel Berger, who had a 65.

Jordan Spieth, coming off consecutive missed cuts, finally got on track. He made a hole-in-one on the par-3 second hole at Conway Farms. He chipped in for birdie on the next hole and was 5 under.