CHICAGO (Ticker) -- Rain spoiled the start of what the
Chicago Cubs hope will be the biggest weekend at Wrigley Field
in more than a decade.

Following a delay of more than 90 minutes, Friday's game between
the Cubs and Pittsburgh Pirates was postponed and rescheduled
as part of a doubleheader Saturday beginning at 1:05 p.m. EDT.

In Saturday's first game, Chicago's Mark Prior (17-6) will face
Josh Fogg (10-8) before Matt Clement (13-12) goes against Ryan
Vogelson (2-1) in the nightcap.

The Cubs head into the final weekend of the season tied with the
Houston Astros for first place in the National League Central
Division. Chicago made the playoffs as a wild card in 1998 but
has not won a division title since 1989.

The Astros continue a four-game series against the Milwaukee
Brewers on Friday night.

Houston won the series opener Thursday while Chicago lost its
series finale in Cincinnati, creating a tie atop the division.

Should the team finish tied, the Cubs will host a one-game
playoff Monday.