Robertson, 21, a Compensation A pick by Oakland in 2012, was traded to Tampa Bay in January, along with John Jaso and Boog Powell. He's responded with three home runs and 25 RBIs for his new organization.
In Tuesday's second game, Rays No. 9 prospect Blake Snell extended his shutout streak to 40 innings with a seven-inning, two-hit night. He also ended last season with three scoreless innings, which means his shutout streak stands at 43 innings including last season's results. The Biscuits won the second game of the doubleheader, 14-0, after dropping the first game to the Smokies, 7-6.
Snell, a southpaw, opened the year with Class A Advanced Charlotte, where he tossed four scoreless starts. He was promoted to Montgomery in time for a May 1 start, and has given up just six hits in 19 innings in his three Double-A contests.
Combined, Snell has gone 5-0 with a 0.00 ERA on the season.
Alex M. Smith is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.