When WR Michael Crabtree was drafted 10th overall by the 49ers this year, I thought he had a great chance to make the biggest fantasy impact of any rookie in 2009. After all, he absolutely shredded the competition at Texas Tech and was going to get an opportunity to step right into the starting lineup in San Fran.

But as soon as Crabtree's contract holdout extended deep into training camp this past August, I began doubting how big of a factor he'd be this year. And once the holdout carried over into the regular season, I, like many, figured this would be a lost season for the first-rounder.

If Sunday is any indication, however, it turns out we all may have been wrong about how quickly this kid can come in and contribute. Playing in his first pro game after finally agreeing to a deal a couple weeks back, Crabtree had five catches for 56 yards at Houston, playing nearly the entire game, lining up in different spots and consistently getting open. With just one game under his belt, the rookie already has the most fantasy value of any Niners wideout.

Considering that he seems to have a nice rapport with QB Alex Smith, who replaced Shaun Hill at halftime Sunday and on Monday was named the 49ers starter going forward, it wouldn't be shocking if Crabtree is a starting-caliber fantasy WR the rest of the way. He picked up the offense much more quickly than anyone could've expected, so playing time won't be an issue, and he's the best weapon San Fran has out wide. The only thing that could hold him back is the team's sometimes stubborn commitment to the run, but it's possible the offense will become more balanced with Smith under center.