Mizuno Pro S-3 Prototype Irons Spotted: What We Know So Far

Adam Schenk Tests New Mizuno Irons at Sanderson Farms Championship
During the Sanderson Farms Championship, Adam Schenk tested some intriguing new irons featuring “S-3” etched on the hosel. He had only a 9-iron and pitching wedge in his bag, suggesting that these clubs might not make it into his tournament setup.

Grain Flow HD Forging & Cavity Design
These irons are crafted using Mizuno’s Grain Flow HD process, forged from 1025E carbon steel for optimal feel and consistency. On the back, they feature a small split cavity, enhancing mass distribution for better control over the center of gravity. This design, paired with Mizuno Pro badging, indicates the S-3 prototype likely belongs to the Pro series rather than the recently released JPX925 lineup. However, given that the 925 Tour has not been announced, perhaps this will be a replacement for the JPX 925 Tour.

Turf Interaction Enhancements
A pre-worn leading edge and trailing edge relief are incorporated into the sole, suggesting a focus on improved turf interaction. The clubface height appears shallow, with a slightly extended blade length—ideal characteristics for players seeking precision and workability.

Retail Availability: Still a Mystery
Mizuno has yet to confirm any release details or whether these irons will be available for retail. Golf enthusiasts will have to wait for updates from Mizuno or keep a close eye on future tournaments for further glimpses of these prototypes.

There hasn’t been any official announcement on the JPX 925 Forged irons, but I’m keeping track of the updates here.