Midway through the second quarter, Jackson split the defense after using a high screen before gathering himself to launch over Harkless, who attempted to provide help from the weakside. Jackson cocked back and flushed hard with one hand over Harkless, much to the delight of the Thunder's bench. The dunk cut Orlando's lead to 31-25.
Jackson, 23, stepped in as Oklahoma City's starting point guard following Russell Westbrook's season-ending knee surgery. The 2011 first-round pick averaged 5.3 points, 2.4 rebounds and 1.7 assists last season, his second year in the NBA.
Harkless, 20, averaged 8.2 points and 4.4 rebounds in his rookie season for the Magic. The 2012 first-round pick was acquired from the Sixers in the four-team trade that sent Dwight Howard from the Magic to the Lakers in 2012.
Orlando Summer League runs from July 7-12 at the Amway Center. Las Vegas Summer League runs from July 12-22 at the Thomas & Mack Center and COX Pavilion.