It looked like Serena Williams was finally getting her career back on track after missing a significant amount of time due to a foot injury. She was set to make her return in March, but it now seems that she is on the shelf indefinitely after having emergency surgery due to a hematoma from a pulmonary embolism.
The embolism, which is a blood clot in the lungs, was considered to be life-threatening, and I would be shocked if she played any tennis in 2011 as she recovers from this. This isn't something where you just sit back for a week then get right back on the tennis court; it's something that takes time to heal.
This generally happens to older people and those who don't exercise (stemming from DVT). Williams obviously doesn't fit that criteria, so this is a strange occurrence. For Williams, this is just one of many strange moments she has had in her career.
Here are the top 10.