The 'Big Cat', Johnny Mize.
Betts now has two different seasons of two games with three homers -- he did the same thing in 2016. That puts him in a class with just one other person all-time: Mize. The former slugging first baseman made his dinger marks in 1938 and 1940.
But after a stellar career with the Cardinals and Giants, the Yankees acquired him in 1949 for the final 5 years of his illustrious career. It was in that time frame, I think 1950, that I witnessed him come up to bat in the late innings of a game at Fenway. And as Mize, so commonly referred to as 'Big Jawn', made his way to the on-deck circle, literally, a hush came over the crowd. I kid you not.
I can't recall the Sox pitcher, but he served one up, and 'Big Jawn' right on cue, deposited it in the right field stands. It didn't make me too happy at the time, particularly since the Red Sox went down to defeat that day. But he left a truly memorable impression in my mind of just how awesome a player he was.