- Bruce Levine, Chicago baseball beat reporter
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On Thursday, Mateo threw five shutout innings as an emergency reliever for Carlos Zambrano, who left that game in the second inning with a sore back. Mateo struck out six that day while throwing 57 pitches. Zambrano went on the disabled list on Friday.
The Cubs will need to make a roster move on Tuesday regardless of Mateo's condition, when right-hander Ramon Ortiz is added to the roster to start the second game against the Nationals.
Bruce Levine covers the Cubs for ESPNChicago.com and ESPN 1000.
Cubs pitcher Marcos Mateo exits game with elbow pain.