In early 2007, International Hall of Fame trainer, Angelo Dundee, who has worked with top notch boxers such as Muhammad Ali, Sugar Ray Leonard and George Foreman, returned to Northern Virginia to be Chief Second for Jimmy.
Lange looked sharp in dismantling his former Contender teammate Jonathan Reid with a ninth round TKO to retain his WBC belt on September 26, 2009 at the Patriot Center.
After the tough defeat, Lange got back on the winning streak with a pair of convincing victories over Jimmy LeBlanc (July 10, 2010, Patriot Center) and Mike McFail (August 20, 2010, Greensboro, NC).
He kept the unbeaten streak going scoring a dramatic 10th round knockout of Joe Wyatt to capture the North American Boxing Association's U.S. 154-pound title on November 6, 2010 at the Patriot Center.
Headlining his 13th show in front of his hometown fans at the familiar confines of the Patriot Center on September 10, 2011, Jimmy beat Raul Munoz by 6th-round TKO to capture the World Boxing Union (WBU) championship.
He successfully defended his WBU title and added the North American Boxing Union (NABU) with a 12-round unanimous shutout decision against Ruben Galvan on February 11, 2012 - his seventh consecutive win and 14th headlining event at the Patriot Center.