There are seven rounds to the NFL Draft, which means that 224 players are selected each year. But there are others who somehow slip through the cracks and end up fighting through adversity to make their mark on the league despite being undrafted. Here are 10 of the best to do so since the NFL trimmed the number of rounds to seven in 1994.
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WR Wes Welker, 2004-15
Welker signed with the Chargers as an undrafted free agent in 2004, but didn't make his mark until joining the Patriots in 2007. He led the league in receptions that season and did so twice more on the way to five Pro Bowl selections during his six New England seasons.
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WR Rod Smith, 1995-2006
Smith signed with the Broncos as an undrafted free agent in 2005 and played all 12 of his NFL seasons in Denver while finishing his career 26th on the all-time receptions list. He was one of John Elway's favorite targets during the Broncos' Super Bowl seasons in 1997 and 1998.
K Adam Vinatieri, 1996-present
Kickers aren't necessarily expected to be selected with a top pick -- or even drafted at all -- but Vinatieri became one of the best ever at his position and remains active at age 43. He has won three Super Bowls with the Patriots and one with the Colts and is currently third on the all-time list for most career field goals made.
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RB Priest Holmes, 1997-2007
Holmes signed with the Ravens as an undrafted free agent in 1997 and won a Super Bowl in Baltimore in 2001. But his real individual success came as a member of the Kansas City Chiefs, when he led the league in rushing yards (1,555) in 2001 and in rushing TDs in 2002 (21) and 2003 (27).
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TE Antonio Gates, 2003-present
Gates signed with the Chargers as an undrafted free agent in 2003, and has remained with the team ever since. He became one of the greatest tight ends in league history and ranks seventh all-time -- and first among active players -- in touchdown catches.
LB James Harrison, 2002-present
Harrison has played all but one of his 13 NFL seasons with the Steelers, after signing with the team as an undrafted free agent in 2002. He won Super Bowls in Pittsburgh in 2005 and 2008 and is a five-time Pro Bowl selection.
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QB Tony Romo, 2004-present
Romo took over as the Cowboys' starting quarterback in 2006 and has remained the starter (when healthy) ever since. A four-time Pro Bowl selection, Romo led the league in completion rate (69.9 percent) in 2014 and has been more than solid for a decade in Dallas at the league's most important position.
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QB Kurt Warner, 1998-2009
It's tough to find an undrafted NFL player who's found more success than Warner. After playing in the Arena League and famously working in a grocery store before he got that chance, Warner ended up leading a Rams team that was dubbed "The Greatest Show on Turf" to two Super Bowl appearances in a three-season span, and a championship in 1999. He also led the Arizona to a Super Bowl appearance in 2009 and recorded the three highest single-game passing yardage totals in Super Bowl history.