She won two
ITF Women's Circuit singles titles. The first was a $10,000 hard-court event in 2003 in Dallas, Texas. The second was a $50,000 hard-court event in 2004 in Tucson, Arizona. She began her tennis career on the ITF Junior Circuit where, in 2003, was ranked in the top 20 in the world in both singles and doubles. She turned professional that same year and competed the next few years on the ITF Women's Circuit. In 2004, began playing more
WTA events and began a full schedule in 2005, when she cracked the top 100 in the world. In 2006, Jamea had her best year of her career, compiling a 26–22 singles record. Jackson is the first tennis player ever to use the
instant replay system in a tour level match, challenging a call in her first round win at the 2006
Nasdaq 100 Open in Miami, against compatriot
Ashley Harkleroad. The call ended up being wrong, and Harkleroad challenged later in the match, becoming the first person to correctly challenge. Jackson ended up winning in a battle 7–5, 6–7, 7–5. She led the
United States Fed Cup team to a victory over
Germany that same year. She won both her matches to notch the win for the U.S. She defeated
Anna-Lena Grönefeld and
Martina Müller to guide the USA into the next round. Jackson reached her first WTA Tour final on June 17, 2006 when she beat both
Jelena Janković and
Maria Sharapova in Birmingham on grass. However, she was defeated by
Vera Zvonareva in the final match of the
DFS Classic in straight sets. At the tailend of 2006 and her short 2007 seasons, Jamea suffered a recurring hip injury requiring surgery. In April 2008, after eight months away from the tour, she came back at a $75,000
ITF event in
Dothan, Alabama. She won 6 consecutive matches, 3 in qualifying and then 3 in the main draw before giving a walkover to
Bethanie Mattek-Sands. She did not play her next event until the
U.S. Open Series, where she scored an upset win over
Marion Bartoli. She played her final match at the
2008 US Open, losing to seed
Alyona Bondarenko losing 2–6, 6–3, 6–2. She officially retired from pro tennis on August 24, 2009 due to her recurring hip injury, as well as her coaching position at Oklahoma State University. ==WTA career finals==