I've never watched Sean Marshall pitch, but I thought I'd do predictive scouting report on him. As in, this is what a scout would report if he only watched Marshall pitch tonight:
LHP or RHP
Notes:
Marshall will use his fastball, which sits anywhere between 83 and 97 MPH, at any time in an at-bat. He also has a breaking ball that he'll throw when he's ahead in the count. He doesn't issue many walks - most hitters facing Marshall tend to swing at his first or second pitch, and they'll usually pop it up in the infield or ground weakly to the right side - and he's able to pitch into the seventh inning without going over 100 pitches.
Conclusion:
Marshall is the best pitcher in baseball today. He has the potential to dominate every time he takes the mound.