I found http://www.baseball-almanac.com/recbooks/rb_hr5.shtml which documents various records of this type (sorry linking in Chrome doesn't work for me here).

All of these have the caveat of consecutive games with home runs.

2 games -- 5 (Done 30 times now. Last before Harper -- Josh Reddick in 2013, First Cap Anson in 1884).

3 games -- 7 (Shawn Green!)

4 games in a row with Homers -- most homers -- 8 Ralph Kiner

5 games in a row with Homers -- most homers -- 8 Bonds / Frank Howard (obviously Kiner if we drop the consecutive games with homers part).

6 games in a row -- 10 Frank Howard (Bonds did this but 9 total)

7 games in a row -- Mattingly 9, Bonds 8 (a different time than above) (so Howard 10 in 7 games if we drop the consecutive).

8 games in a row -- Mattingly 10 (so Howard if we drop the consecutive).

So appears to be:

7 in 2

8 in 3/4/5 games

10 in 6/7/8/9

I had Shawn Green on my team when he hit 4 HRs in a game, so I remember that. I just checked, he also hit one the next day, giving him 5 in two games. He ALSO hit 2 more the next day, which gives him 7 HRs in 3 games.

Looked up Carter as well. He did hit 5 in two games in 1985.

Seeing as I was able to find two such instances just by memory, I'm guessing the feat isn't that rare.

Kent,

There's a spelling mistake in your post. 'records' should be 'steroids'.

I googled it, but I couldn't find it at a quick glance. I'm pretty sure I remember Gary Carter (Praise Be Unto Him), hitting 5 HRs in two games in 85. Could be wrong. I wonder how many times it's been done? A few, I'd guess.

5 homers in 2 games.  When do we start checking for records.

Umm...make that three home runs in three AB's.

And the game is only through five innings.

Two home runs in his first two AB's today against Koehler. The first was an opposite field blast where the ball just seemed to keep carrying and the second was an upper deck, no doubter to RF.

It's his sixth career multi-homer game. I still sometimes forget he is only 22 years old.

His start earns him his first comment of the year. On pace for 50 homers :-)

The big mistake was for fantasy owners to bid him up so aggressively last spring, when there was still doubt that he was ready to break out. But the belief that he will have a monster year is so strong that another year of overspending this year wouldn't be a surprise. The fact of his very good August is fuel for the fire, especially after dealing with a hand injury that stopped him or hindered him for May through July. When healthy he has been a pretty good ballplayer and an electric personality. It's a mistake to allow the latter and all the promise he exhudes to blind competitive owners to the risks of betting on the come with a youngster, especially one who hasn't proved himself capable of superior contact rates, but for teams needing a homer on draft day (or really, more like 40 of them) Harper is one young hitter who might exceed even wildly optmisitic expectations. Though probably not.

—from The Fantasy Baseball Guide 2015
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