The Chicago Cubs today claimed catcher Rene Rivera off waivers from the New York Mets.

The Chicago Cubs today placed left-handed pitcher Jon Lester on the 10-day disabled list with left lat tightness/general shoulder fatigue and placed right-handed pitcher Justin Grimm on the 10-day disabled list with an infection in his right index finger. Right-handed pitcher Felix Peña and left-handed pitcher Rob Zastryzny have been recalled from Triple-A Iowa.

The Chicago Cubs today placed catcher Willson Contreras on the 10-day disabled list (retroactive to August 10) with a right hamstring strain and recalled catcher Victor Caratini from Triple-A Iowa.

Joe Maddon to host third annual Respect 90 main event August 17.

The Chicago Cubs today placed right-handed pitcher Koji Uehara on the 10-day disabled list with a right neck strain and recalled right-handed pitcher Justin Grimm from Triple-A Iowa.

The Chicago Cubs today named Single-A South Bend outfielder D.J. Wilson and Triple-A Iowa right-handed pitcher Jen-Ho Tseng the organization's minor league player and pitcher of the month for July, respectively. This is Tseng's second monthly award, as he previously earned the honor in July of 2014 with Single-A Kane County.

The Chicago Cubs today recalled infielder Tommy La Stella from Triple-A Iowa. Left-handed pitcher Rob Zastryzny has been optioned Triple-A.

Recall LHP Rob Zastryzny from Triple-A Iowa.

The Chicago Cubs today added left-handed pitcher Justin Wilson and catcher Alex Avila to the 25-man roster. In corresponding roster moves, right-handed pitcher Justin Grimm and catcher Victor Caratini have been optioned to Triple-A Iowa.