Hisashi Iwakuma and Jon Lester get the day started with an afternoon game in Chicago as the Mariners visit the Cubs. Iwakuma ranks seventh in the majors in winning percentage since joining the majors in 2012. Not bad, considering the Mariners have not been a great team in that time frame. Lester tries to continue his home dominance. He owns a 2.18 ERA at Wrigley this season.

Baltimore opens an important AL East series in Toronto with Kevin Gausman facing Marco Estrada. The Orioles lead over the Blue Jays is 1 1/2 games. Gausman’s poor record comes mostly from this struggles on the road. He is 0-6 with a 4.94 ERA away from Camden Yards. Estrada suffers some bad luck as well, with a 5-4 record despite a 2.94 ERA. Or maybe his luck evens out. His ERA is much lower than his FIP.

The Rockies try to continue their surge into the playoff picture as Tyler Chatwood takes on Steven Matz of the Mets. Chatwood was built for the Rockies road games, 5-0 with a 1.30 ERA away from Coors with no home runs allowed in 48 1/3 innings. Matz allowed eight of his 11 home runs at Citi Field this year.

Finally, the Nationals and Giants continue their series between first place teams as Max Scherzer battle Jeff Samardzija. Sherzer has been on a roll since the start of June, tied with Michael Fulmer for the best ERA in the majors in that time, 1.71. Samardzija allowed just four of his 19 home runs at home this season.

Enjoy!