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Jesse Rogers ESPN Staff Writer 

The Cubs are calling up a top pitching prospect as righty Adbert Alzolay will take the place of Tim Collins who was designated for assignment. The Cubs believe Alzolay is on top of his game right now as Theo Epstein said recently his curveball was the best he's seen from him. Fellow Venezuelan and Cubs catcher Willson Contreras had this to say: “I hear really good stuff about him. Really good fastball command. Good spin rate. He's striking people out, he's throwing hard and it makes me proud. I know where he comes from, how hard he works every day to be here and finally his day has come.” A home grown pitcher has been a rare sight at Wrigley Field under Epstein. Alzolay could pitch in relief as soon as Thursday night.

Jesse Rogers ESPN Staff Writer 

Watch Willson Contreras discuss his 2 homer night including his first grand slam since the last time he faced the White Sox.

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Bradford Doolittle ESPN Staff Writer 

Things are looking dire for the White Sox tonight, down three runs with one out to go. But we did get our first glimpse at catcher Zack Collins, who made his MLB debut with a pinch-hitting appearance against the Cubs' Steve Cishek in the ninth. Collins walked, which is appropriate given his scoring report. More importantly, tomorrow he will have big league ID codes at Baseball Reference and Fangraphs.