Serven went 2-for-4 with a pair of two-run home runs during an 11-3 win against the Mets on Saturday.
Making his second career start, Serven launched home runs in the second and sixth innings after going hitless in his debut Wednesday. The 27-year-old hit five home runs in 23 games at Triple-A Albuquerque, so the power could be legitimate, although it's uncertain how long Serven will stick with the team.