Oh, you mean Chris Sale of the White Sox. Pretty well. His career stats are in the table below.
Now his being a reliever in 2010-11 helps, since relievers usually have better stats than starters. From 2007-11, relievers had, on average, an ERA that was .037 lower than starters. Sale, a lefty, also has faced left handed batters about 40% of the time. So that helps him. But he is certainly doing well this year as a starter. In 32 IP, he has an ERA of 2.81, with 24 hits allowed and 8 walks, 29 strikeouts and just 2 HRs allowed. If Strasburg had Sale's career stats or stats this year, I doubt anyone would think he was not living up to his potential.