De Leon fired five no-hit innings for High-A Charlotte against Dunedin on Tuesday, Marc Topkin of the Tampa Bay Times reports.
The 24-year-old right-hander also notched five strikeouts and issued a pair of walks in his outing, which was an improvement over his first trip to the mound last Thursday. De Leon had given up a pair of earned runs on five hits over 3.1 innings in that start, although he'd racked up seven whiffs as well. De Leon conceivably could ascend to Triple-A Durham for his next start, although the Rays may opt to have him make at least one appearance for the Stone Crabs.