PITTSBURGH -- A day after Edwin Jackson left the Cardinals' game against the Rockies early with a right hamstring cramp, he walked around the clubhouse without any noticeable problem.

Jackson said after Sunday's start that he didn't expect the cramp to affect his next start. Manager Tony La Russa echoed that feeling Monday.

"Physically, sometimes that cramp is really deeper in there or it's a strain, but it doesn't appear to be," La Russa said. "They put pressure on it after the game, and it responded well."

In other injury news, infielder Nick Punto began taking ground balls on Sunday, but he did not travel with the team to Pittsburgh and is not yet able to take batting practice.

"He's improving, he's doing different kinds of drills, but he's still not 100 percent clear to take BP or even throw," La Russa said.

Punto has been on the disabled list since July 29 with a strained left oblique. He said Thursday he hopes to be back with the team within the next three weeks.

Schumaker hits leadoff, plays center field

PITTSBURGH -- Skip Schumaker found himself in two unfamiliar places in the lineup on Monday -- leading off and playing center field.

It was his first start of the season in center field. He played 79 games in center field for the Cardinals in 2008 but has played just eight games there since, as he has primarily played second base. Manager Tony La Russa said Schumaker's versatility was useful, as he wanted to give regular center fielder Jon Jay a day off to work on his swing after a disappointing homestand.

Schumaker pointed out that Monday's starter, Jake Westbrook, tends to get outs on the ground, so it might not matter if he's rusty in center.

Schumaker had led off eight times this season before Monday, and he had a .367 batting average and a .908 OPS in the No. 1 spot.

"I like Skip first and [Rafael] Furcal [second], because I think it will help us stay out of a double play," La Russa said.

Schumaker leads the Cardinals with a .351 batting average since the All-Star break entering Monday.

"He's got such a winning-type attitude," La Russa said. "Right now, with the health that we've got, we've got more good players than spots in the lineup. We're in good shape."

Cards sign second-round Draft pick Tilson

PITTSBURGH -- The Cardinals signed second-round Draft pick Charlie Tilson hours before the signing deadline on Monday. He will be assigned to the Cardinals' Gulf Coast League affiliate in Jupiter, Fla.

Tilson, an outfielder from New Trier, Ill., was committed to play at the University of Illinois. He batted .409 with 26 steals during his senior year at New Trier High School and was the Illinois Gatorade Player of the Year.

With the signing of Tilson, the Cardinals have signed each of their first 13 Draft picks and 35 picks overall. The Cardinals signed their first-round pick, second baseman Kolten Wong, on June 25.

"Having all of our top draftees signed is certainly a highlight to this year's Draft," general manager John Mozeliak said. "We feel that we have added a strong complement of players to our organization. Jeff Luhnow and the entire scouting staff did another tremendous job this year."

Teams have until 11:01 p.m. CT on Monday to come to terms with Draft picks.