Buwhite, there’s one thing you have to watch out for, and that is that you have to step off the rubber before throwing to any base, because you do NOT want to get called for a balk. If that happens the runner on third will score and any other runners will advance one base, and the one thing that has to be prevented is that runner on third scoring.
Let’s look at the situation. Runners on first and third, say there’s one out, it’s the eighth inning and your team is hanging on to a one-run lead. Forget about the guy on first—you have to watch the runner on third. Now there was a situation like that the other day, the Yankees and Baltimore, and Joba Chamberlain was pitching. He threw a wild pitch that went to the backstop, and the runner on third broke for the plate—but that wild pitch ricocheted off the backstop and right back to the catcher, who threw to Chamberlain who had rushed to cover the plate—and the runner found himself blocked by Chamberlain’s leg and never touched the plate. The umpire correctly called him out. That’s one way to do it, but a lot depends on that ricochet, and it might be a trifle risky.
A better idea might be to have your infield go to double-play depth and then pitch to the batter, get him to hit one on the ground to one or another of the infielders, and go for a DP or at least a force at home. And if the runner on first takes second base, so what? There would be two out, and you’d have some breathing room. Or you could do what Mariano Rivera does—just strike out the batter and get the next one to pop up! 8)