Extra bases

Extra bases

• The Cubs will have to make at least one, and most likely two roster moves prior to Thursday's game to make room on the roster for starter Ryan Dempster. Dempster has been on the disabled list since April 18 with a strained right quad and was scheduled to start in the series finale against the Reds.

Randy Wells made two starts in Dempster's spot, and was expected to go back to Triple-A Iowa to make room. The Cubs also have to make a move if they activate Kerry Wood from the DL. He has not pitched since April 13 because of fatigue in his right shoulder.

Cubs manager Dale Sveum would not reveal the moves until Thursday.

"We want to make sure nobody shows up to the ballpark sick or anything like that," Sveum said.

• The Cubs' defensive positioning is the culmination of lots of homework on the part of Sveum and the coaching staff. They watch video, study spray charts.

"It's a 90-percent rule," Sveum said. "If a guy is going to hit the ball there 90 percent of the time, then why not play there?"

• On May 9, Dempster will host the third annual Casino Night to benefit the Ryan and Jenny Dempster Family Foundation and raise money to fight 22q (also known as DiGeorge syndrome), a disorder which his daughter, Riley, has. There will be a live auction, and the items will include a baseball signed by Babe Ruth and Lou Gehrig, a Ryder Cup golf tournament package, an Ernie Banks autographed jersey and a behind-the-scenes experience at MLB Network.

The event will be held at the Palmer House Hilton Chicago, and include performances by American Idol singer Crystal Bowersox and Chicago's own John Vincent. For more information, go to the Dempster Family Foundation website.