Jason Day tweaks back in victory at Match Play

Jason Day of Australia watches his tee shot on the first hole during round-robin play against Graeme McDowell at the Dell Match Play Championship golf tournament at Austin County Club, Wednesday, March 23, 2016, in Austin, Texas. (AP Photo/Eric Gay) (The Associated Press)

Jason Day, of Australia jumps over a creek as he looks for his ball on the fourth hole during round-robin play against Graeme McDowell at the Dell Match Play Championship golf tournament at Austin County Club, Wednesday, March 23, 2016, in Austin, Texas. (AP Photo/Eric Gay) (The Associated Press)

Graeme McDowell of Northern Ireland watches his tee shot on the first hole during round-robin play against Jason Day at the Dell Match Play Championship golf tournament at Austin County Club, Wednesday, March 23, 2016, in Austin, Texas. (AP Photo/Eric Gay) (The Associated Press)

Jason Day overcame an early deficit to win his opening match in the Dell Match Play. Now he has to overcome a bad back.

Day was reaching for his back for a few holes until he grabbed it after a tee shot on the 16th hole and then dropped to one knee as he closed out Graeme McDowell, 3 and 2.

Day headed straight for the trailer to get it worked on.

At least he has one victory. Rickie Fowler rallied from 3 down on the back nine at Austin Country Club to square his match, only for Jason Dufner to win the next two holes in a 2-and-1 victory.

The round-robin format means Fowler can still win his group, though he will need help.