The 2012 US Open has not produced the type of earth-shattering upset that can occur in a Grand Slam. The 128-player draw allows players that are not ranked high enough to get their chance to face higher ranked opponents and improve their ranking.
We have still seen some surprising outcomes that have opened up quarters of the draw to players that have advanced beyond their seed.
There are always upsets in each round of a Grand Slam. Some are more surprising than others. Here are the ones that have shaken up the draw in 2012.