By Matt Audilet San Francisco Giants outfielder Joc Pederson has confirmed that his altercation with Reds outfielder Tommy Pham stemmed from a fantasy football disagreement during this past season. After the Giants’ 5-1 loss on Friday night, Pederson detailed the argument that led to their pregame spat. He said Pham accused him of cheating in their league after he put a player on injured reserve and replaced him with a fantasy football free agent. “It was a surprise,” he said, per NBC Sports. “There was no real argument. He kind of came up and said, like, ‘I don’t know if you remember from las…