Never until those two combined had there been 2 players with at least 500 home runs to their credit on the same team at the same time.
Many MLB teams have scored runs with multiple players in the same inning. Many MLB teams have also had multiple home runs by different players occur in the same inning, including teams like the Yankees, Blue Jays, and Red Sox.
1973 Atlanta Braves
51 players have hit two home runs in the same inning. Micheal Cuddyer of the Minnesota Twins was the last to accomplish this feat on 23Aug2009 vs the Royals This was part of a 8 run inning for the Twins.
as far as i can tell, it hasn't happened since 1954
None. 4 Home Runs yes, 4 grand slams no.
Once. The 1961 Yankees were paced by sluggers Roger Maris (61 home runs) and Mickey Mantle (54 homers).
The 1961 Yankees - Roger Maris had 61 and Mickey Mantle had 54.
Mark Bellhorn of the Chicago Cubs in the fourth inning of a game on August 29, 2002 and Carlos Baerga of the Cleveland Indians in the seventh inning of a game on April 8, 1993 are the only two players that have hit home runs from both sides of the plate in the same inning.
Jeremy Burnitz and Richie Sexton of the Milwaukee Brewers against the Arizona Diamondbacks on September 25, 2001.