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Reminder: Always double check the lineup card before rosters lock to make sure that a player you've chosen to roster is playing that day, and check the weather to make sure your players won't get rained out of their game.
Pitcher
A very low priced, salary relief gamble play that I like a lot is John Lamb ($5,300) against the Cardinals. Lamb's ERA is poor, but he has some strong peripherals, including a 26% K%, 10.3% swinging strike% and 3.77 FIP. He is also generating a large amount of pop ups at 17%, and has excellent opp. exit velocity readings at about 84 mph, which is well above the MLB average of about 88 mph. Lamb faces a Cardinals offense that is not so great vs LHP; on the year, they rank 26th in wRC+ at 83 and strike out 2nd most vs LHP at 23.4% (although that 83 wRC+ is a little skewed because the Cardinals offense has been missing Matt Holliday to injury for much of the season). I expect Lamb to be very low owned because of his poor ERA and think he can be an excellent tournament play to bolster a lineup with high upside hitting because of his low salary.
Hitting
Cubs lefties vs Wily Peralta
Peralta has allowed a .301/.348/.533 slash to lefty hitters this year with a 5.26 FIP. Kyle Schwarber (175 wRC+/.338 ISO vs RHP), Anthony Rizzo (147 wRC+/.267 ISO vs RHP), and Chris Coghlan (129 wRC+/.218 ISO vs RHP) have been the most productive lefty hitters in the Cubs lineup vs right handed pitching, and also figure to bat in good lineup slots; the last lineup the Cubs used vs RHP was (from 1-5):
Dexter Fowler
Kyle Schwarber
Chris Coghlan
Anthony Rizzo
Kris Bryant
2B- Neil Walker ($3,400) vs Jon Gray
Walker gets a massive park upgrade in Coors Field and has hit RHP to a 118 wRC+ with a .177 ISO.
3B- Evan Longoria ($3,000) vs Eduardo Rodriguez
Longoria has hit LHP to a 159 wRC+ and .212 ISO and gets a park upgrade in Fenway.
SS- Jhonny Peralta ($2,300) vs John Lamb
I advocated starting Lamb above, so I don't expect Peralta to be in position for too many RBIs, but he's hit LHP to a .221 ISO with an above average 108 wRC+. He's priced $100 over the minimum and has a good chance of hitting for an extra base hit against a lefty. I like him as a punt play.
You can follow me on twitter at @TimFinn521