Hey, Runatic!
In Eugene in 2012, Liu Xiang won the 110 m hurdles in 12.87 seconds, matching the world record at the time.
But the tailwind was +2.4 m/s, above the +2.0 limit for records. The mark was listed as 12.87w. The victory stood; the record did not.
The wind was so helpful it overstepped the rules. Read more