Celtics, Sam Hauser agree to four-year, $45 million extension

That’s the final infinity stone.

According to ESPN’s Adrian Wojnarowski the Boston Globe’s Adam Himmelsbach, Sam Hauser has signed a four-year, $45 million extension to stay with the Celtics through 2029. All seasons are fully guaranteed.

To put the 26-year-old sharpshooter’s new deal in perspective, Klay Thompson signed a three-year, $50 million deal with the Dallas Mavericks and Buddy Hield got four years at $38 million from the Golden State Warriors.

Hauser went from developmental success story starting out in Maine to key cog in Boston’s top-8 rotation in the Finals. He shot 42.4% from behind the arc last season, including 11-of-23 in June paired with lockdown defense on Luka Doncic.

As Woj…