Here's my list of 10 defensive linemen who gave me fits and continue to be troublesome for NFL offensive linemen (in alphabetical order):

Mark Schlereth's 10 Toughest Guys to Block

Sam Adams, defensive tackle, Baltimore Ravens For a 340-pound man, he has unbelievable athletic ability -- and played like it last year. He maybe played 40 percent of the snaps, so he gave great effort and made a lot of plays.

Luther Elliss, defensive tackle, Detroit Lions Big, strong, tenacious. He's an excellent run defender and pass rusher.

La'Roi Glover, defensive tackle, New Orleans Saints Came out of nowhere last year to put up big sack numbers. Plays with great leverage. Has the ability to get under guys and throw them off balance.

Jevon Kearse, defensive end, Tennessee Titans Relentless pass rusher. Plays hard every down. Athletically, he is a freak -- hence, the nickname.

Chester McGlockton, defensive tackle, Denver Broncos A combination of size, quickness and speed. If the Broncos can keep him fresh and playing hard, he could have a great season.

John Parrella, defensive tackle, San Diego Chargers Not that well known, but he's the best one-on-one defenders in the NFL.

John Randle, defensive end, Seattle Seahawks Great leverage. Has outstanding speed, quickness and strength. It's hard to play against someone like Randle, who can do everything.

Warren Sapp, defensive tackle, Tampa Bay Buccaneers You name a way a guy can beat you, and he can beat you that way. Speed, quickness, power. He's the complete package.

Michael Strahan, defensive end, New York Giants Plays with great leverage and strength and is relentless. Never takes a play off.

Bryant Young, DT, San Francisco Plays extremely hard. Is not one-dimensional. He rushes the passer as well as plays run defense as well as anybody.

Former NFL guard Mark Schlereth, now an analyst for NFL 2Night, played 12 seasons in the NFL -- six with the Washington Redskins and six with the Denver Broncos -- and was a member of three Super Bowl championship teams.