Jordan Spieth made a change in what's in his bag, moving from Titleist's 716 AP2 irons to their 718 AP2 irons at the 2017 Emirates Australian Open.
A year ago, Spieth won the tournament for the second time in three years using the 716 AP2s, making the switch that week (for the second time) from the 714 model and employing the 2017 version of the Pro V1. In 2017, Spieth finished eighth using the 718 AP2s and putting the new Vokey SM7 wedges into play at The Australian Golf Club.
Spieth is not typically quick to change equipment, though he has been using the Aussie Open as a safe spot to make alterations to his bag makeup and equipment.
After leading the PGA Tour in strokes gained approach last season, he moved into new irons. The 718 AP2s are different from the 716s in several ways. A new, high-strength Japanese steel called SUP10 is forged and used to make the body and face insert on the longer irons, moving on from a 1025 carbon steel body and 17-4 stainless steel face insert. The lighter material made is easier to lower center of gravity for higher launch and improved ball speeds.
On the 7-iron, the AP2 has a 1025 stainless steel face insert, while the 8-iron through pitching wedge are forged from 1025 carbon steel for better feel and control with scoring clubs.
As for the four Vokey wedges Spieth carries, he moved from the SM6 to SM7 prototypes, and they should be made from carbon steel in a raw finish, per PGATour.com's Jonathan Wall.
Spieth is in the field at the 2017 Hero World Challenge, and this should be his bag moving forward.