Right-hander Nick Tropeano, the Astros' No. 13 prospect, combined with two relievers to throw a two-hit shutout Monday, leading Triple-A Oklahoma City to a 7-0 victory at Sacramento.
Tropeano struck out eight batters and walked none. He allowed both hits -- singles in the second and seventh innings -- and threw 109 pitches. Between the two hits, Tropeano retired 16 straight batters, six by strike out.
Left-hander Pat Urckfitz relieved him with two outs in the seventh and retired four consecutive hitters. Right-hander Paul Clemens pitched a perfect ninth to complete the shutout for the RedHawks.
Outfielder Domingo Santana, the Astros' No. 3 prospect and No. 53 on MLBPipeline.com's Top 100 Prospects list, went 3-for-4 with a three-run home run. It was his first homer since returning to Oklahoma City last week after his most recent stint in the Major Leagues.
With the victory, Tropeano improved to 8-5 with a 3.12 ERA. He has struck out 114 batters and walked 32 in 115 1/3 innings. His ERA is the third best in the Pacific Coast League.
Teddy Cahill is a reporter for MLB.com. Follow him on Twitter at @tedcahill. This story was not subject to the approval of Major League Baseball or its clubs.