re: Source: Extra-inning, extra-runner rule to remain (MLB)

quote:

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How big of a lead can the runner take when the limit has been reached?

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As big as they want. However, the pitcher can still throw to first. They just have to get the out, or the player gets 2nd. So if they take too big a lead, they might get thrown out.

I don't love this rule, but if you're going to have the pitch clock, you need this or the pitcher would just throw to first every time they got close to going over on the clock.