You only have to score one more run than the other guys - and the Orioles did that on Friday night thanks to Adam Jones hitting a solo homer off Justin Verlander. One run was all they needed.
Sometimes, low-scoring games are painted as pitchers duels even when they might be better termed as "bumbling offense duels." The Orioles and the Tigers on Friday night did not play one of these games - it was an actual pitcher's duel, and when the dust settled, the O's were on top, 1-0.
That's the second shutout of the year for the O's and the second 1-0 victory.