The Pirates and Reds set a Great American Ballpark record with 10 home runs, before the game was suspended, tied at seven after six innings.
The game will be resumed later, and the two teams will try to set the NL record for combined home runs in a game, which is 11, most recently set by Chicago and Philadelphia in 1979.
When the game is back on, each team will have nine outs to try and set the league record.
The MLB record is 12 combined homers in a game, which occurred twice, coincidentally both times between the Detroit Tigers and Chicago White Sox.
Here are the first 10, and look out for the record when the game continues...