Brock Lesnar Reportedly Tells WWE He's Leaving After WrestleMania 34
Contract speculation adds fuel to Lesnar's UFC return rumours.

Brock Lesnar's future has been the subject of mass speculation over the past 24 hours.
It was reported yesterday that 'The Beast' had re-entered the U.S. Anti-Doping Agency testing pool to run down his current MMA suspension ahead of a potential UFC return this winter, though the UFC have since countered this.
The rumours persist, however, and Pro Wrestling Sheet have now reported that should Lesnar re-enter the pool, it'll be to keep his options open. His current WWE contract expires shortly after WrestleMania 34 next April, and the write-up suggests that Lesnar has already told company officials he won't be re-signing.
There's a strong chance Brock could be doing this to gain leverage in any WWE contract negotiations. There'll be nothing stopping him from leaving for the UFC once he has fulfilled the remaining six months of his suspension, which may coax WWE into making a big money offer to retain him.
Regardless of whether not Lesnar has re-entered the pool (or is in the process of doing so), his future is clearly in his own hands. As one of the biggest draws in UFC history, he'd be a huge boon to that company, and a massive loss for WWE.