What is unique about the NCAA men's basketball tournament in 2023?
The tournament didn't include any top seeded teams in the final four, and included an exceedingly rare upset of a 16th seed over a 1 seed when Purdue lost.
Below is an instruction that describes a task, paired with an input that provides further context. Write a response that appropriately completes the request.
### Instruction: What is unique about the NCAA men's basketball tournament in 2023?
### Input: 
### Response: The tournament didn't include any top seeded teams in the final four, and included an exceedingly rare upset of a 16th seed over a 1 seed when Purdue lost.