UFC Legend Anderson Silva holds the record for longest title streak in UFC history at 2,457 days; 16 consecutive wins and 10 title defenses. However, since his title loss back in 2013, things have been somewhat downhill for the middleweight.
Back in 2015, he failed a in-compettion drug test and was suspended for one year by the Nevada Athletic Commission. Since then he's won one out of his last three fights and on November 25, the fighter was supposed to take on Kelvin Gastelum. However, it was recently announced that the middleweight has failed a USADA out-of-competition drug test and is now out of the UFC fight against Gastelum.
No word yet as who the replacement opponent will be for Gastelum as the promotion is currently seeking one at the moment. As for Silva, he will meet with the USADA once again and a punishment will be determined for his failure of the drug test.