During his rookie year Haislip was inserted into the starting line-up for the final nine games of the 2002–03 NBA season.

He was signed by the Indiana Pacers during the 2004–05 season in order to fill the team's gap at power forward, due to the 15-game suspension of Jermaine O'Neal.

In March 2006, he left the team without authorization and returned to the United States due to "family issues", according to a teammate.

He was selected to the BSL (Turkish Basketball Super League) All-Star Game and also participated in the Slam Dunk contest, which he won.

His final game was played on January 16, 2010, in a 86 - 92 loss to the Memphis Grizzlies where he recorded 4 points and 3 rebounds.

[10] In December 2010, Caja Laboral opened disciplinary proceedings against Haislip because he left the city without permission from the club.

[14] In March 2012, he signed a two-month contract with Champville SC, and became the highest paid foreigner in the history of the Lebanese Basketball League.

On November 24, 2014, Haislip signed a one-month deal with Club Africain of the Tunisian League.