Reliever Juan Cruz made his second rehab appearance at Double-A Altoona on Thursday, throwing a scoreless inning and striking out one. He threw 13 pitches.
"He had a good outing last night," manager Clint Hurdle said on Friday. "He did throw his breaking ball, his changeup, fastball. Velocity was increased, 93 to 95 [mph]. It was another good step forward for him."
Two more home runs at PNC Park will give the Pirates 800 at the stadium, which opened in 2001.
Pittsburgh's 2.56 home ERA is the lowest in the Major Leagues. The Pirates also lead baseball in saves, with 41.