"We definitely had some opportunities to break it open. … We've got to come up with a hit in that situation, or a good at-bat.
And we just weren't able to tonight," Stammen said.
Regarding Tatis, who has yet to hit a home run this season, Stammen noted the pressure the young star is facing.
"He's working every day to try to figure that out," Stammen said. "[It's] natural for anyone to press when they're trying to get out of a slump."
Padres starter Randy Vasquez limited the damage to three runs over 4 1/3 innings despite allowing hard contact early.
"After that first pitch to Ohtani, I felt like I was able to keep my plan of attack," Vasquez said through an interpreter.
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The Dodgers had previously rested Ohtani from the batting lineup during his prior three pitching starts to manage his workload before reinstating him as a full two-way player for Wednesday's contest.