Reds have the edge

Posey does most of his damage against lefties, but he might not face one in the NLDS. Lisa Blumenfeld/Getty Images

The San Francisco Giants and Cincinnati Reds will square off in the NLDS. Here's a look at what to watch, who will win, and why.

Key matchup: Buster Posey vs. Aroldis Chapman

Posey put together an amazing offensive season that likely is going to end with the NL MVP trophy on his mantel, but he did most of his damage against left-handed pitching, hitting .433/.470/.793. Conversely, he hit only .292/.382/.440 against right-handed pitching, which is a nice line but not spectacular. The Reds' pitching staff is heavily right-handed, so Posey's chances to tee off on a left-hander is likely to happen only if he gets a chance to face the Reds' flamethrowing closer.