The shower began before the scheduled 7:05 p.m. starting time and the game was called after a wait of nearly two hours.
This is the Dodgers' only visit to Camden Yards this season, so the teams will play a split-doubleheader on Saturday. The first game will start at 1 p.m. and the second at 7:05 p.m.
Los Angeles hasn't visited Camden Yards since 2002. The teams also met in California in 2004.
The Dodgers entered the game mired in a four-game losing streak. Los Angeles scored only seven runs during the skid, which included a three-game sweep by the visiting San Diego Padres.
Baltimore is in the midst of a nine-game homestand.
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