It's never easy to make the decision to sit a fantasy football star who has been leading the way all season long, but the truly great fantasy owners do what is necessary to win.
In Week 15, several top point-producers figure to have tough games, whether they are pitted against stingy defenses or simply in a funk.
Here's a look at the fantasy stars you should avoid starting in Week 15.
Tony Romo, QB, Dallas Cowboys
Coming off a 12-point fantasy day against the Cincinnati Bengals, Tony Romo has another challenging matchup against the Pittsburgh Steelers in Week 15.
The Steelers have allowed 5.7 yards per pass attempt this season (best mark in the NFL) while allowing 16 passing touchdowns (ninth). This is not the pass defense Romo wants to face coming off a rough game.
Stevan Ridley, RB, New England Patriots
Stevan Ridley has scored the seventh-most fantasy points among running backs in standard leagues this season, but facing the San Francisco 49ers is quite the task.
The 49ers have allowed just 3.6 yards per carry (third in the NFL) and three rushing touchdowns (tied for first) this season.
Frank Gore, RB, San Francisco 49ers
Frank Gore has scored the ninth-most fantasy points among running backs this season, but one look at what the Patriots did to Arian Foster in Week 14 tells you all you need to know: New England's run defense, led by Vince Wilfork, is much improved this season.
Gore hasn't been immune to the bad game this season, and New England's run defense seems to be getting better and better. This game will also be held in Foxboro.
Wes Welker, WR, New England Patriots
I feel like I'll eat my words every time I go against the determined Wes Welker, but the 49ers have allowed 5.9 yards per pass attempt this season (second-best in the NFL) and 13 passing touchdowns (tied for third).
Welker also faced a similar defense against the Texans last week and managed just three catches for 52 yards. I suspect that other Patriots will hurt the 49ers more through the air, as was the case against Houston.
Greg Olsen, TE, Carolina Panthers
Greg Olsen has scored the fifth-most fantasy points among tight ends this season, but he heads into San Diego to face the Chargers in Week 15.
The Chargers have generally been tough on tight ends in 2012. Tony Gonzalez had a big game against them in Week 3, but top-five tight ends Jimmy Graham (one catch, four yards) and Heath Miller (five catches, 66 yards) struggled.
They have also allowed 6.9 yards per pass attempt (12th in the NFL).