Extra bases

• Zac Rosscup was optioned to Triple-A Iowa to make room on the Cubs' 25-man roster for Felix Doubront, who was activated from the disabled list. However, Rosscup was available for both games in the Cubs' doubleheader on Saturday as the 26th man. Rosscup will not be available on Sunday in the series finale, but he will be back Monday when rosters expand.

• Soler has matched Javier Baez game for game, as both homered in their first and recorded multi-homer games in their third. They are the only Cubs in franchise history with three home runs in their first three games and join St. Louis' Joe Cunningham (1954) as the only three big league players to do so since 1900.

• Edwin Jackson threw a light bullpen session on Saturday, and the right-hander is hopeful he will be able to return in the final month of the season. Jackson was placed on the disabled list on Aug. 21 with a right lat strain.

"It's getting better," Jackson said. "Just needed rest and recovery.

Carrie Muskat is a reporter for MLB.com. She writes a blog, Muskat Ramblings, and you can follow her on Twitter @CarrieMuskat. This story was not subject to the approval of Major League Baseball or its clubs.