How to counter runner spamming when moving second?

[MrUseless]

Because I only play a couple games at a time, I nearly always go second. (I guess there is a way to go first by starting lots of games at the same time, never tried it). Anyway, I often come up against players who are spamming me with runners, and since I'm going second I'm on defense the whole game until someone makes a mistake or I just fall behind.

Any good strategies for dealing with this? It seems especially prevalent on maps with two spawn points, but I'm sure most of you know this.