Fantasy baseball stock watch - Week 13

Maintaining your fantasy baseball roster can be a daunting task with all of the variables to keep track. Thank goodness for this weekly Yahoo Sports cheat sheet of players to keep and players to drop. Find out whose stock is going up and whose stock is plummeting this week.

St. Louis Cardinals starting pitcher Carlos Martinez throws during the first inning of a baseball game against the Philadelphia Phillies, Sunday, June 22, 2014, in St. Louis. (AP Photo/Scott Kane)
Ellis bunt, 4 relievers help Cardinals top Phils
St. Louis Cardinals starting pitcher Carlos Martinez throws during the first inning of a baseball game against the Philadelphia Phillies, Sunday, June 22, 2014, in St. Louis. (AP Photo/Scott Kane)
Detroit Tigers' J.D. Martinez watches his ball after hitting a three-run home run off Cleveland Indians relief pitcher John Axford in the eighth inning of a baseball game on Friday, June 20, 2014, in Cleveland. Tigers' Miguel Cabrera and Victor Martinez also scored on the hit. (AP Photo/Tony Dejak)
J.D. Martinez, Victor Martinez homer for Tigers
Detroit Tigers' J.D. Martinez watches his ball after hitting a three-run home run off Cleveland Indians relief pitcher John Axford in the eighth inning of a baseball game on Friday, June 20, 2014, in Cleveland. Tigers' Miguel Cabrera and Victor Martinez also scored on the hit. (AP Photo/Tony Dejak)
Toronto Blue Jays Brett Lawrie reacts after he was hit in the hand with Chase Whitley's fourth-inning pitch in a baseball game at Yankee Stadium in New York, Wednesday, June 18, 2014. (AP Photo/Kathy Willens)
Jays put Cecil on DL, recall Delabar; Lawrie out
Toronto Blue Jays Brett Lawrie reacts after he was hit in the hand with Chase Whitley's fourth-inning pitch in a baseball game at Yankee Stadium in New York, Wednesday, June 18, 2014. (AP Photo/Kathy Willens)
San Francisco Giants' Angel Pagan runs with his bat as he flies out against the Los Angeles Dodgers during a baseball game, Friday, May 9, 2014, in Los Angeles. The Giants won 3-1. (AP Photo/Danny Moloshok)
San Francisco Giants' Angel Pagan runs with his bat as he flies out against the Los Angeles Dodgers during a baseball game, Friday, May 9, 2014, in Los Angeles. The Giants won 3-1. (AP Photo/Danny Moloshok)
San Francisco Giants' Angel Pagan runs with his bat as he flies out against the Los Angeles Dodgers during a baseball game, Friday, May 9, 2014, in Los Angeles. The Giants won 3-1. (AP Photo/Danny Moloshok)

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