Berkman, who is coming back from right knee surgery performed on May 25, opted out of a Minor League rehab assignment. Berkman said the durability of his knee is not the issue, and he'd prefer to work his way back at the big league level.
"For me, I felt like I missed a lot of time. I want to get back in there as quick as I can," Berkman said. "I still feel like I can be competitive, so if that's the case, why not come back?"
Berkman has had plenty of success playing at Great American Ball Park, batting .330 with 23 homers and 58 RBIs in 59 games. He and the Cards will face 24-year-old Mike Leake. The right-hander is 3-1 with a 2.55 ERA in his last 10 starts, and has a 1.74 ERA in his four most recent outings.
The Reds are one of just two teams, along with the Marlins, who have only used five starting pitchers this season -- a modern franchise record. All five of those starters have thrown a complete game this season. Leake threw a complete game on June 29 against the Giants.
Cardinals: Lynn given extra rest, Lohse to start
Lance Lynn was scheduled to start on Saturday, but the Cardinals pushed his start back to Monday to give him more time to rest. Former Red Kyle Lohse will get the start. Lohse spent parts of the 2006 and '07 seasons in Cincinnati, going 9-17 in 33 games with the Reds.
Lohse is 1-0 with a 0.69 ERA in two starts against Cincinnati this season.
Reds: Rolen out of starting lineup on Friday
Reds third baseman Scott Rolen did not start Friday's second-half opener against the Cardinals, but did walk in a pinch-hit at-bat in the seventh inning. Despite playing in the final game of the first half, Rolen missed a week of action due to back spasms before playing nine innings on Sunday. The 37-year-old Rolen is batting just .178 with 16 RBIs in 129 at-bats this year.
Zack Cozart's 21 doubles prior to the All-Star break were the most ever by a rookie shortstop. His nine homers tied for fifth most before the break among rookie shortstops.
Current Reds hitters are batting .216 off Lohse. Rolen has the most at-bats against Lohse, going 5-for-21 with a homer and double, while Joey Votto is 6-for-17 with a pair of doubles.