"It's disappointing, but what can I say?" Chavez said. "I feel pretty close, but I understand the situation with the team right now. They had to make a move, but it's not fun. It's disappointing. Hopefully, I'll get healthy pretty soon.
Chavez injured his hamstring running to first base Tuesday night. He went on the DL earlier this year with a strained left oblique.
"I feel a lot better," he said, adding that he'll be ready before his 15 days are up. "Just coming off the DL, to go back on it again, for me it's not fun."
Tolleson didn't have to stay in the minors for the minimum 10 days because he's replacing a player going on the DL. He's batting .237 with two homers and six RBIs in 12 games with the Orioles this season.
Robert Andino is making his first start at third base.
For the Orioles:
Brian Roberts 2B
J.J. Hardy SS
Chris Davis DH
Adam Jones CF
Matt Wieters C
Mark Reynolds 1B
Steve Pearce RF
Steve Tolleson LF
Robert Andino 3B
Tommy Hunter RHP
For the Pirates:
Alex Presley LF
Neil Walker 2B
Andrew McCutchen CF
Garrett Jones DH
Casey McGehee 1B
Pedro Alvarez 3B
Jose Tabata RF
Rod Barajas C
Clint Barmes SS
Erik Bedard LHP
The Orioles (6-2) have the third-best interleague record this year behind the Yankees and Nationals (both 7-2).
If the Orioles beat the Pirates tonight, it will be their first interleague sweep since June 25-27, 2010, when they swept the Nationals in Baltimore.
In his four games during this interleague homestand, Davis is batting .412/.474/1.000 with a double, three homers, eight RBIs and five runs scored. At home this season, Davis is batting .319 (29-for-91) with four doubles, nine homers, 23 RBIs and a 1.029 OPS in 26 games.
Jones (five) and Wilson Betemit (four) lead the majors in home runs in close/late-game situations, which means the game is in the seventh inning or later and the batting team is leading by one run, tied, or has the potential tying run on base, at bat or on deck.
Four of the top 13 reliever ERAs in the American League belong to Orioles: Jim Johnson (fourth, 1.26), Pedro Strop (seventh, 1.44), Darren O'Day (12th, 1.78) and Luis Ayala (13th, 1.82).
The Orioles have 28 hits in the last two games, setting a season high over a two-game span. They had 27 hits over two games June 3-5.
The Orioles have 17 extra-base hits in the last five games after posting 16 extra-base hits over the previous nine.
The Orioles have hit nine home runs in the last five games after hitting nine in their previous 12 games.