Is there any way Quicksilver can beat the Flash, or is it a lost cause?

[Noek]

lets just say speedforce gives flash a lot of bullshit he can do, though if you want one of the most straightforward reasons, its due to being fast enough to timetravel.

It does come with its flaws though. They just aren't brought up a lot.

[CosmiComic]

Imagine if the Speed Force combined with Pym Particles and Chaos Magic into the Deux Ex Machina Force!

[gonnagiveittoya]

Broken? How so?

Flashs speed is essentially a deus ex machina meaning there's a lot of stuff that he's done that's absolutely insane Iif you account for the actual speed to do it. Specifically, as Death Battle mentions, his 6 billion MPH speed.