BMW Championship

Jason Day celebrates with his 3-year-old son Dash and wife Ellie after winning the BMW Championship.

Members of the gallery watch Jason Day tee off on the 2nd hole during the final round of the BMW Championship.

Jason Day lines up a putt on the 2nd hole during the final round.

Rickie Fowler tees off on the 1st hole during the final round.

Dustin Johnson tees off on the 1st hole during the final round.

Scott Piercy hits an approach shot on the 1st hole during the final round.

Rory McIlroy walks down the fairway after teeing off on the 1st hole.

Scott Piercy tees off on the 1st hole during the final round.

Members of the gallery walk by a puddle of mud near the 3rd hole during the final round.

Jason Day stretches before teeing off on the 1st hole during the final round.

Mark Bowman, 55, watches Dustin Johnson practice on the driving range during the final round.

Jason Day plays a shot on the 18th hole.

Jason Day reacts after putting for birdie on the 18th green.

Brendon Todd plays his shot from the 17th tee.

Scott Piercy plays a shot on the 16th hole.

A marshall is seen on the 18th green.

Jason Day putts on the tenth green at Conway Farms.

Jason Day plays a shot on the 15th hole.

Jason Day putts for par on the 13th green.

Jason Day walks to the sixth green.

Rickie Fowler shakes hands with Brendan Steele after finishing on the 18th green.

Daniel Berger reacts to a missed putt on the eighth green.

Scott Piercy reacts on the 16th green.

Jason Day follows his shot off the 15th tee in first-round play at the BMW Championship golf tournament at Conway Farms Golf Club on Sept. 17, 2015, in Lake Forest.

Ricky Fowler hits his approach shot on 14 in first-round play at the BMW Championship golf tournament at Conway Farms Golf Club on Sept. 17, 2015, in Lake Forest.

The gallery watches as the 11:42 a.m. tee time group, Zach Johnson, Dustin Johnson, Jim Furyk work the 11th green during first round play at the BMW Championship golf tournament at Conway Farms Golf Club on Sept. 17, 2015, in Lake Forest.

Jordan Spieth lets his club go as his tee shot on 15 finds water during first round play at the BMW Championship golf tournament at Conway Farms Golf Club on Sept. 17, 2015, in Lake Forest.

Jim Furyk checks his ball just off the 10th green in first round play at the BMW Championship golf tournament at Conway Farms Golf Club on Sept. 17, 2015, in Lake Forest.

Jim Furyk tees off on the 10th hole in first-round play at the BMW Championship golf tournament at Conway Farms Golf Club on Sept. 17, 2015, in Lake Forest.

Dustin Johnson retrieves his putt on the 10th hole in first-round play at the BMW Championship golf tournament at Conway Farms Golf Club on Sept. 17, 2015, in Lake Forest.

Zach Johnson tees off on the 10th hole in first-round play at the BMW Championship golf tournament at Conway Farms Golf Club on Sept. 17, 2015, in Lake Forest.

Golfers putt in a practice area before the first round of the BMW Championship golf tournament at Conway Farms Golf Club on Sept. 17, 2015, in Lake Forest.

John Doty, 62, walks past empty picnic tables before the first round of the BMW Championship golf tournament Sept. 17, 2015, at Conway Farms Golf Club in Lake Forest.