A week of good or bad matchups can make all the difference in Fantasy Baseball.

And before you make any kind of claim on the waiver wire or set any lineups for Week 8 (May 14-20), you need to see what Chris Towers has to say. As Senior Editor for Fantasy at CBS Sports, Towers is one of the most respected voices in the industry. If there's anybody who can spot an edge in a matchup or identify a player in position to break out, it's him.

In late April, Towers identified Royals outfielder Jorge Soler, who had a .279 batting average and was owned in less than 20 percent of CBS Sports leagues, as a waiver wire pickup who could be a breakout star. The result? Soler, now owned in almost 80 percent of leagues, enters Saturday hitting .320 with five home runs and 17 RBIs. Anybody who picked him up weeks ago got a complete steal.

Now, Towers has studied the upcoming schedule and is sharing his best and worst hitter matchups for Week 8 of Fantasy Baseball here at SportsLine. They'll help you figure out who to sit, start, add, and drop this week. Without Towers' advice, you're flying blind.

One thing we can tell you for this week: Towers isn't high on Mets outfielder Yoenis Cespedes, even though he's in the top 10 in the National League in RBIs with 27.

"Only five games on the schedule, and they have to face the toughest part of the Diamondbacks' rotation," Towers says. "Right now, Yoenis Cespedes is the only must-start player on the Mets, and with manager Mickey Callaway admitting Cespedes isn't at 100 percent right now, it's not inconceivable that you might sit Cespedes this week."

Towers has also identified a sleeper who is heating up and gets a dream slate of pitching matchups this week. This hitter should return massive Fantasy numbers, and he might be on the waiver wire in your league right now.

So who should you start this week? Join SportsLine here to get CBS Sports Fantasy Editor Chris Towers' best and worst hitting matchups for Week 8, and see which sleeper you need to be all over because of his schedule.