Dvoracek attended Lake Dallas High School in Lake Dallas, Texas where he played football at the positions of defensive tackle and offensive guard. During his senior year, he was named to the Houston Chronicle's Top 100 list and the Dallas Morning News's Texas Top 100. He was also named all-district both on offense and defense in his senior year, while tallying up 79 tackles, 9.5 sacks, four fumble recoveries, and 10forced fumbles in just seven games.
College career
Dvoracek attended the University of Oklahoma, where he majored in management. In 49 games at Oklahoma, Dvoracek started 28 times. He finished his career with 136 tackles, 16 sacks, one interception and three fumble recoveries. He was a consensus All-Big 12 performer in 2003 and 2005. In 2004, Dvoracek was suspended from the Sooners after an alleged assault that resulted in the hospitalization of a long time high school friend, then 21-year-old Matthew Wilde. He was backup to future Chicago Bears teammate, Tommie Harris, and started ahead of future WWE World Heavyweight Champion, Jack Swagger.
Professional career
Chicago Bears
The Chicago Bears selected Dvoracek in the third round of the 2006 NFL Draft. He missed most of his rookie season after sustaining a foot injury in the preseason. Dvoracek started his first professional game against the San Diego Chargers on September 9, 2007, but left the game with a season ending torn ACL injury. Dvoracek recovered during the 2008 offseason, injured his calf before the Bears training camp. He was placed on season-ending injured reserve with elbow bursitis on December 9. He finished the 2008 season with 29 tackles and two passes defensed on 12 games. Dvoracek suffered a sprained MCL during the Bears second preseason game on August 22, 2009. He underwent arthroscopic knee surgery to assess the severity of the injury. The examination concluded that Dvoracek had also injured his ACL, and would miss the 2009 season. He was waived/injured on August 31 and subsequently reverted to injured reserve, his fourth consecutive year ending on the IR list.
Omaha Nighthawks
Dvoracek was signed by the Omaha Nighthawks in 2010. He was re-signed by the team on July 15, 2011. He was let go after the 2011 season.